Isometric System, Method and Apparatus for Isometric Exercise

ABSTRACT

System, method and apparatus for carrying out isometric exercises for therapeutic purposes. As employed in a therapeutic mode the apparatus may only be programmed within mandated therapeutic parameter limitations. During therapeutic trials, the user is visually and aurally cued throughout the test sequence and the therapeutic data evolved during the regimen is recorded and recoverable from archival memory. Particular target force modes can be selected to allow stimulation of nitric oxide release.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of the filing date of U.S. Patent Application Ser. No. 61/723,981, entitled “Isometric System, Method and Apparatus for Isometric Exercise,” filed on Nov. 8, 2012, the disclosure of which is incorporated by reference herein in its entirety.

FIELD OF THE INVENTION

Various aspects of the present invention are generally directed to isometric exercise and a system, method, and apparatus for isometric exercise, and more specifically to the use of the system, method, and apparatus for isometric exercise to treat various conditions.

BACKGROUND OF THE INVENTION

This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present invention, which are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of various aspects of the present invention. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art.

The use of isometric exercise, as opposed to rhythmic exercise, in the general field of athletic strength development, as well as a therapy for strength recovery, has been the subject of somewhat controversial discourse over the past decades. In general, isometric exercise has been considered to promote coronary risk factors (among other deleterious effects) [See generally: Vecht R J, Graham G W S, Sever P S. “Plasma Noradrenaline Concentrations During Isometric Exercise.” Brit Heart J. 1978; 40:1216-20; and Chrysant S G. “Hemodynamic Effects of Isometric Exercise in Normotensive Hypertensive Subjects”: Hypertension. Angiology 1978:29(5):379-85].

Because isometric exercise was thought to promote coronary risk factors, it was generally not considered useful in treating conditions such as hypertension and other conditions that may include a condition of the circulatory system, such as erectile dysfunction, type II diabetes, obesity, etc. Indeed, in many of these cases, isometric exercise was thought of as being contraindicated.

Hypertension (also known as high blood pressure) is a chronic medical condition in which the blood pressure in the arteries is elevated, thereby causing the heart to work harder than normal to circulate blood through the body. Hypertension is associated with an increased risk of a wide range of disease and disorder, including stroke, organ failure, and cardiopathy. Risk factors for hypertension include obesity, genetic factors, smoking, diet, and inactivity.

Erectile dysfunction (ED) is a sexual dysfunction characterized by the inability to develop or maintain an erection of the penis. Stimulation of penile shaft by the nervous system leads to the relaxation of smooth muscles of corpora cavernosa (the main erectile tissue of penis) and the inflow of blood to that tissue, which results in penile erection. Impotence may develop due to a lack of adequate penile blood supply, and so there may be various circulatory causes of ED. For example, restriction of blood flow can arise from impaired endothelial function due to the usual causes associated with coronary artery disease. Diabetes may be another cause of ED.

Diabetes mellitus type 2 (“type 2 diabetes,” also known as non-insulin-dependent diabetes mellitus or adult-onset diabetes) is a metabolic disorder that is characterized by high blood glucose, insulin resistance, and relative insulin deficiency. Obesity is thought to be one primary cause of type 2 diabetes in people who are genetically predisposed to the disease.

Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy and/or increased health problems. Body mass index (BMI), a measurement which compares weight and height, presently defines people as overweight (pre-obese) if their BMI is between 25 and 30 kg/m², and obese when it is greater than 30 kg/m². Obesity increases the likelihood of various diseases, such as heart disease and type 2 diabetes. Obesity is most commonly caused by a combination of excessive food energy intake, lack of physical activity, and genetic susceptibility.

Hypertension, hypercholesterolemia, atherosclerosis and cardiovascular disease are interrelated in their causes, treatment and effect on the body (and, as can be seen from the discussion above, ED, diabetes, and obesity may also have interrelated causes—or be the cause of one another, as well as with hypertension). The class of drugs known as HMG-CoA reductase inhibitors or statins is widely prescribed for treatment of hypercholesterolemia and associated cardiovascular disease, including the debilitating effects of progressive atherosclerosis. Various statins that have been clinically utilized include atovastatin, cerivastatin, fluvastatin, ovastatin simvastatin among others. The statin drugs were initially prescribed to relieve hypercholesterolemia, and to reduce the blood concentrations of low-density lipoprotein (LDL) and triglycerides. It has become apparent that the statin drugs apparently have additional therapeutic benefits that are independent and or interrelated with the effects of reduction in blood cholesterol concentration. The effect of statin drugs thus includes a reduction in vascular inflammation, and a protection of the heart against ischemic disorders. [For more information on the pleiotropic effects of the statin drugs see generally: Davignon J., Beneficial cardiovascular pleiotropic effects of statins, Circulation, 109 (23 Suppl 1):11139-43 (2004); Elrod J W, Lefer D J The effects of statins on endothelium, inflammation and cardioprotection, Drug News Perspect, 18(4):229-36 (2005, May); Assanasen C, et al., Cholesterol binding, efflux, and a PDZ-interacting domain of scavenger receptor-BI mediate HDL-initiated signaling, J Clin Invest., 115(4):969-77 (2005 April).]

Although the exact mechanism of statin drug action for cardioprotection is not fully known, it is widely believed that statin drugs stimulate nitric oxide synthase activity in vascular endothelium, and presumably in other tissues. Disorders of the vascular endothelium related to nitric oxide metabolism are believed to play a crucial role in the pathogenesis of atherosclerosis in hypercholesterolemia. Thus, certain cardioprotective effects of statin drugs can be mimicked in part by other physiological stimuli that induce nitric oxide synthase and increase nitric oxide availability. Moreover, nitric oxide metabolism is interconnected with the metabolism and regulation of LDL, cholesterol and triglycerides, and with the progress of atherosclerosis. As one example of this interrelationship, changes in nitric oxide levels have been inversely correlated with changes in LDL-cholesterol concentrations.

Nitric oxide (NO) has been identified as a signaling molecule in mammalian and other systems. NO, is a labile, endogenously produced gas that is enzymatically synthesized, can rapidly diffuse, and quickly disappear. NO is known to be a potent regulator of blood pressure due to its activity as a vasodilator, but has a diverse action on a wide variety of organ systems. Endothelial nitric oxide synthase (eNOS) is induced to synthesize NO by blood vessel wall shear stress. Upon the activation of eNOS and induction of NO synthesis, NO is released by endothelial cells. Based on the position of endothelial cells lining the inner surface of blood vessels, NO can be released into the blood stream, where it can act both locally and systemically. NO induces vasodilation by a reduction in the contraction of smooth muscle cells lining blood vessels. NO acts as a negative feedback for mean arterial pressure, since as arterial pressure increases, wall shear stress increases, inducing eNOS and increasing the NO concentration. As NO concentration increases, smooth muscle contraction is decreased, blood vessel lumen diameter increases, arteriole resistance decreases and arterial pressure decreases. The modulating action of wall shear stress on eNOS activity and NO production serves to maintain wall shear stress at a constant level. A diagram highlighting some of the interactions between NO, local metabolites, wall shear stress and smooth muscle contraction is shown in FIG. 20.

Prolonged elevation of wall shear stress, in addition to activation of eNOS, leads to the transcriptional activation of the eNOS gene in endothelial cells. After several hours, eNOS enzyme levels increase due to the induced transcription of the eNOS gene. Increased levels of eNOS enzyme in endothelial cells increases those cells ability to release NO following induction of eNOS activity. It is thus expected that those cells which have experienced prolonged elevation of wall shear stress will have an increased ability to synthesize NO, and the same levels of wall shear stress will result in a greater synthesis of NO. One effect of increased eNOS levels is a reduction in the amount of wall shear stress that is required to induce biologically significant NO levels. Blood vessels that have been entrained by prolonged elevation of wall shear stress will release more NO relative to shear stress, and the vasodilation effect of NO will be increased, Higher relative NO concentration leads to reduced smooth muscle contraction, increased blood vessel lumen diameter and decreased arteriole resistance. Assuming that the cardiac output of the heart does not change, the net effect of a lower “set point” for responding to wall shear stress is a reduction in total peripheral resistance in blood vessels and a reduction in mean arterial pressure.

Similar to the effects of the statin drugs, an improvement in endothelial function is interconnected with LDL and cholesterol blood levels and NO bioavailability. LDL and cholesterol have been shown to prevent the down-regulation of eNOS. In turn, down-regulation of eNOS is apparently mediated by the stimulation of levels of caveolin-1 by LDL. Caveolin-1 is an important inhibitor of eNOS catalytic activity. Modulation of NO is expected to affect the interrelated blood lipid concentrations of VHDL, HDL, LDL, and cholesterol. To the extent that the pleiotropic activity of the cholesterol lowering statin drugs is modulated by NO levels, stimulation of NO bioavailability is expected to affect blood lipid composition. For additional background on the interrelationship between LDL and NO, see generally: Martinez-Gonzalez, J., et al., Arterioscler. Thromb. Vasc. Biol. 21: 804-809 (2001).

As described above, it has been known for some time that exercise can provide relief from hypertension in certain individuals. As the modulation of nitric oxide levels is part of a feedback system that responds in part to the stretching and extensibility of blood vessels of the body, it is hypothesized that exercise in general plays a role in stimulating cycles of NO release, and effectively providing some of the benefits of statin drugs, including improvement in endothelial function, increased nitric oxide bioavailability, anti-oxidant effects, anti-inflammatory protection, and stabilization of atherosclerotic plaques. Notwithstanding the effects of the modulation of NO bioavailability, exercise is known to modulate blood cholesterol and blood lipid composition.

However, as also stated above, previous conventional wisdom would suggest that isometric exercise would be ineffective in treating such conditions (as opposed to rhythmic or dynamic exercise), due to the belief that isometric exercise promotes coronary risk factors (among other deleterious effects). And so, rhythmic or dynamic exercise is primarily used as a therapy for various conditions (rather than isometric exercise).

SUMMARY OF THE INVENTION

Certain exemplary aspects of the invention are set forth below. It should be understood that these aspects are presented merely to provide the reader with a brief summary of certain forms the invention might take and that these aspects are not intended to limit the scope of the invention. Indeed, the invention may encompass a variety of aspects that may not be explicitly set forth below.

One aspect of the present invention includes a system and method of using isometric exercise to treat various conditions, including erectile dysfunction, type 2 diabetes, and obesity. In general, the system includes applying a force to an isometric exercising mechanism via an elected exercisable muscle group of the musculature of a user. The mechanism is responsive to the force applied, and the application of force increases shear stress on a blood vessel wall of the user. This induces the synthesis of endothelial nitric oxide synthase, which results in synthesis of NO in the user, thereby increasing the amount of bioavailable NO in the user. In certain embodiments, through the selection of the particular muscle group used, or through the particular exercise protocol, or any combination, a therapy for a particular condition (e.g., ED, obesity, or diabetes) may be provided.

Another aspect of the present invention provides an apparatus for carrying out a controlled isometric regimen by a user. In one exemplary embodiment, the apparatus may include a handgrip-based dynamometer. Being microprocessor driven, the instrument is programmed to carry out established diagnostic as well as newly developed grip-based isometric regimens. When employed for carrying out a diagnostic maximum grip test, the diagnostician selects configuration parameters and the instrument provides both visual and audible prompts and cues throughout the procedure. Maximum grip forces for each of the sequence of trials of this procedure are selected typically by the diagnostician and when so selected are recorded in instrument memory along with calendar data, and processor computed values for average grip force, standard deviation of the force values throughout a sequence of tests and corresponding coefficients of variation. At the termination of the diagnostic procedure, memory recorded test data are displayable to the diagnostician and may be downloaded through a communications port to a computer facility.

When used for a therapeutic purpose, use of the apparatus begins with a determination of the maximal isometric force which can be exerted by a patient with any given muscle (e.g., skeletal muscle or group of muscles) of such patient. The determined maximal isometric force is recorded. The patient, then, is periodically permitted to intermittently engage in isometric contraction of the given muscle at a fractional level of the maximal force determined for a given contraction duration followed by a given resting duration. A perceptible indicia correlative to the isometric force exerted by the given muscle is displayed to the patient so that the patient can sustain the given fractional level of maximal force.

As described above, it has been known for some time that exercise can provide relief from hypertension in certain individuals. As the modulation of nitric oxide levels is part of a feedback system that responds in part to the stretching and extensibility of blood vessels of the body, it is hypothesized that exercise in general plays a role in stimulating cycles of NO release, and effectively providing some of the benefits of statin drugs, including improvement in endothelial function, increased nitric oxide bioavailability, anti-oxidant effects, anti-inflammatory protection, and stabilization of atherosclerotic plaques. Notwithstanding the effects of the modulation of NO bioavailability, exercise is known to modulate blood cholesterol and blood lipid composition.

However, as also stated above, previous conventional wisdom would suggest that isometric exercise would be ineffective in treating such conditions (as opposed to rhythmic or dynamic exercise), due to the belief that isometric exercise promotes coronary risk factors.

In addition to the coronary risk factors believed to be promoted by isometric exercise, early subjects or trainees undergoing isometric exercise stressed the involved musculature to their full or maximum capability (Kiveloff, et al., “Brief Maximal Isometric Exercise in Hypertension”, J. Am. Geriatr. Soc., 9:1006-1012, 1971) or at some submaximal force as long as it could be sustained, in either case only terminating with the onset of unendurable fatigue. Such approaches often have incurred somewhat deleterious results as evidenced by the injuries sustained in consequence of improper weightlifting procedures. Weightlifting procedures or endeavors exhibit a significant isometric factor. See generally: Lind A R. “Cardiovascular Responses to Static Exercise” (Isometrics, Anyone?) Circulation 1970:41(2):173-176; and Mitchell J H, Wildenthal K. “Static (Isometric) Exercise and the Heart: Physiological and Clinical Considerations”. Ann Rev Med 1974; 25:369-81.

However, as such attitudes persisted, some investigators commenced to observe contradictions to these generally accepted beliefs. See for, example, the following publications: Buck, et al., “Isometric Occupational Exercise and the Incidence of Hypertension”, J. Occup. Med., 27:370-372, 1985; Choquette. et al., “Blood Pressure Reduction in ‘Borderline’ Hypertensives Following Physical Training” Can. Med. Assoc. J. 1108:699-703, 1973; Clark, et al., “The Duration of Sustained Contractions of the Human Forearm of Different Muscle Temperatures”, J. Physiol., 143:454-473, 1958; Gilders, et al., “Endurance Training and Blood Pressure in Normotensive and Hypertensive Adults”, Med. Sci. Sports Exerc. 21:629-636, 1989; Hagberg, et al., “Effect of Weight Training on Blood Pressure and Hemodynamics in Hypertensive Adolescents”, J. Pediatr. 1104:147-151, 1984; Harris, et al., “Physiological Response to Circuit Weight Training in Borderline Hypertensive Subjects”, Med. Sci. Sports Exerc., 19:246-252, 1987; Hurley, et al., “Resistive Training Can Induce Coronary Risk Factors Without Altering Vo.sub.2 max or Percent Body Fat” Med. Sci. Sports Exerc. 20:150-154, 1988; Hypertension Detection and Follow-up Program Cooperative Group, “The Effect of Treatment on Mortality in ‘Mild’ Hypertension”, N. Engl. J. Med., 307:976-980, 1982; Kiveloff, et al., “Brief Maximal Isometric Exercise in Hypertension”, J. Am. Geriatr. Soc., 9:1006-1012, 1971; Merideth et al., “Exercise Training Lowers Resting Renal but not Cardiac Sympathetic Activity n Humans”, Hypertension, 18:575-582, 1991; Seals and Hagberg, “The Effect of Exercise Training on Human Hypertension: A Review”, Med. Sci. Sports Exerc. 16:207-215, 1984; and Hanson P. Nagle F. “Isometric Exercise: Cardiovascular Responses in Normal and Cardiac Populations.” Cardiology Clinics 1987; 5(2): 157-70. Such speculation on the part of these early observers was confirmed by Wiley, and was taken further by Wiley in the 1990s as a possible treatment for hypertension, as described in U.S. Pat. No. 5,398,696 entitled “Isometric Exercise Method for Lowering Resting Blood Pressure and Grip Dynamometer Useful Therefore”, issued Mar. 21, 1995 and as described in the following publication: Wiley, et al., “Isometric Exercise Training Lowers Resting Blood Pressure”, Med. Sci. Sports Exerc. 29:749-754, 1992 incorporated by reference herein in its entirety.

With the approach of protocol developed by Wiley, the isometric regimen is closely controlled both in terms of exerted force and in the timing of trials or exertions. The system and method described by Wiley are known to be useful for treating hypertension. Hypertension is associated with an increased risk of a wide range of disease and disorder, including stroke, organ failure, and particularly cardiopathy. The exact causes of hypertension are rarely known with certainty, but risk factors for hypertension include obesity, genetic factors, smoking, diet and inactivity. As Wiley has shown, not all forms of exercise provide equivalent therapeutic benefit to the cardiovascular system and for the treatment of hypercholesterolemia, with a protocol for brief maximal isometric exercise providing a clear benefit.

In about 1998, the above-noted Wiley protocols as described in connection with Merideth et al., “Exercise Training Lowers Resting Renal but not Cardiac Sympathetic Activity n Humans”, Hypertension, 18:575-582, 1991, were incorporated in a compact, lightweight isometric device. This device was a hand-held dynamometer. The diagnosis of patient hand-arm strength using isometric-based testing has been employed by physiologists, physical therapists and medical personnel for over three decades. These procedures function to evaluate hand-arm trauma or dysfunction and involve the patient use of a handgrip-based dynamometer. The dynamometer is grasped by the patient and squeezed to a maximum capability under the verbal instruction of an attending therapist or diagnostician. The hand dynamometer most widely used for these evaluations incorporates a grip serving to apply force through closed circuit hydraulics to a force readout provided by an analog meter facing outwardly so as to be practitioner readable. Adjustment of the size of the grip of the dynamometer is provided by inward or outward positioning of a forwardly disposed grip component. The dynamometers currently are marketed under the trade designation: “Jamar Hydraulic Hand Dynamometer” by Sammons Preston of Bolingbrook, Ill. An extended history of use of these dynamometers has resulted in what may be deemed a “standardization” of testing protocols. For instance, three of the above-noted grip length adjustments are employed in a standardized approach and verbal instructions on the part of the testing attendant, as well as the treatment of force data read from the analog meter are now matters of accepted protocol. In the latter regard, multiple maximum strength values are recorded whereupon average strengths, standard deviations and coefficients of variation are computed by the practitioner. In one test, the instrument is alternately passed between the patient's right and left hands to derive a maximum strength output reading each 1.5 seconds or 2.5 seconds. Reading and hand recording strength values for such protocols has remained problematic. The protocols, for example, have been the subject of recommendations by the American Society of Hand Therapist (ASHT) and have been discussed in a variety of publications including the following: Mathiowetz V., Federman S., Wiemer D. “Grip and Pinch Strength: Norms for 6 to 19 Year Olds.” The American Journal of Occupational Therapy 40:705-11, 1986; Mathiowetz V., Donohoe L., Renells C. “Effect of Elbow Position on Grip and Key Pinch Strength.” The Journal of Hand Surgery 10A; 694-7, 1985; Mathiowetz V., Dove M., Kashman N., Rogers S., Volland G., Weber K. “Grip and Pinch Strength: Normative Data for Adults.” Arch Phys Med Rehabilitation 66:69-72, 1985; and Mathiowetz V., Volland G., Kashman N., “Reliability and Validity of Grip and Pinch Strength Evaluations.” The Journal of Hand Surgery 9A:22-6, 1984.

Described in detail in U.S. Pat. No. 5,904,639 entitled “Apparatus, System, and Method for Carrying Out Protocol-Based Isometric Exercise Regimens” by Smyser, et al., the hand-held dynamometer has a hand grip which incorporates a load cell assembly. Extending from the hand grip is a liquid crystal display and two user actuated control switches or switch buttons. The display is mounted in sloping fashion with respect to the grip such that the user can observe important visual cues or prompts while carrying out a controlled exercise regimen specifically structured in terms of force values and timing in accordance with the Wiley protocols. This device is therapeutic as opposed to diagnostic in nature and is microprocessor driven with archival memory. External communication with the battery powered instrument is made available through a communications port such that the device may be configured by programming and, additional data, such as blood pressure values and the like may be inserted into its memory from an external device. Visual and audible cueing not only guides the user through a multi-step protocol but also aids the user in maintaining pre-computed target level grip compression levels.

This described apparatus, incorporating the protocol of Wiley, provided a system for treating hypertension. However, while Wiley has previously shown the possible benefits of isometric exercise in the treatment of hypertension, there still is lacking a similar treatment for afflictions such as ED, diabetes, and obesity.

To that end, there is widespread discourse on the relative benefits of particular forms of exercise, and there is an ongoing need for patients suffering from hypertension, hypercholesteremia, atherosclerosis, and other cardiovascular and cardiopulmonary diseases, as well as ED, diabetes, and obesity to be provided a therapeutic treatment, and to obtain the maximum benefit from the exercise utilized. Patients who are suffering from severe cardiovascular disease may be unable to engage in intense exercise, and many patients may be unable to engage in other forms of exercise due to limitations in time or facility availability. The invention disclosed herein provides for a device, system and method of exercise that can be optimized to provide an improved benefit to the patient in stimulating endothelial function, overall blood vessel health, and cardiovascular benefit while at the same time limiting the dangerous side effects of intensive exercise. Thus, aspects of the present invention provide for the treatment of hypertension via isometric exercise. Aspects of the present invention also provide for treatment of ED, diabetes, and obesity via isometric exercise (which was heretofore nonexistent).

Of course, it will be beneficial to incorporate improved diagnostic features for hand-arm evaluation techniques with therapist or practitioner designed therapeutic protocols specifically tailored to the condition of a given patient and which provide a control over such therapies clearly establishing such therapies as beneficial to strength development and recovery. One particular diagnostic and therapeutic feature that would be beneficial to incorporate is protocol that modulates wall shear stress of blood vessels so as to increase the bioavailability of nitric oxide and foster a reduction in total peripheral resistance in blood vessels and a reduction in mean arterial pressure, along with the other physiologic benefits associated with stimulation of NO signaling pathways, including reduction in LDL and cholesterol concentrations and an increase in arterial flexibility. Such a device could also be used with protocols designed to treat other conditions, such as ED, obesity, and diabetes.

For each of the diagnostic procedures, the widthwise extent of the instrument grip may be both varied in standard ½ inch increments from a minimum width. The grip is further configured such that the visually perceptible readout of the instrument may be viewed only by the diagnostician where deemed appropriate.

An important aspect of the therapeutic method associated with the instrument of the invention resides in the limiting of user performance to carry out the regimen of trials. In this regard, the instrument is programmed to perform only within predetermined and mandated test limits. Each therapeutic regimen is based upon an initial evaluation of the maximum gripping force capability of the user. Under that limitation, target load factors, hold on target load intervals, intervening rest intervals and trial repetition numbers may be elected only from pre-established and mandated memory retained ranges. The program also nominates rest intervals and hold on target intervals in correspondence with user elected target force factors. Thus, valuable strength recovery and development may be achieved but only within safe limits.

During each of the above therapeutic regimens, an audible warning is elicited whenever the user grip force value exceeds a computed upper limit. During each timed interval wherein the user is prompted to grip at a target force value computed with respect to the pre-tested maximum grip force, a dynamic bar graph and center point display is provided as a visual cue related to desired grip performance. Additionally, a rapid succession of score values are computed and the average thereof recorded at the end of each trial of a given regimen. These scores permit a therapist to access the quality of the performance of the user. In general, trial data is recorded in conjunction with calendar data and, as before, may be downloaded to a computer facility from an instrument contained communications port.

An additional aspect of the invention is to influence biological parameters of the user by selecting target loads that stimulate particular biological pathways. In one target force mode, the invention allows stimulation of nitric oxide bioavailability, which directly influences resting blood pressure and overall cardiovascular health. In other instances, the target force mode can be directed to maximize the exercise benefit for modulating blood lipid composition, including reducing low density lipoprotein (LDL) and cholesterol in the blood. The system, method, and apparatus described herein also provide for treatment of various other conditions, such as erectile dysfunction, obesity, and type II diabetes.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

FIG. 1 is a perspective view of apparatus according to the invention showing its orientation with respect to a users hand wherein its display is viewable by such user;

FIG. 2 is a perspective view of the apparatus of FIG. 1 showing the orientation of the apparatus with respect to the users hand wherein the display thereof is not visually accessible to the user;

FIG. 3 is an exploded perspective view of the apparatus of FIG. 1;

FIG. 4 is a side sectional view of the apparatus of FIG. 1;

FIG. 5 is a side view of the apparatus of FIG. 1 showing a minimum grip width configuration;

FIG. 6 is a side view of the apparatus of FIG. 1 showing an orientation for user viewing of its display and a grip widthwise extent ½ inch greater than the grip orientation of FIG. 5;

FIG. 7 is a side view of the instrument of FIG. 1 showing an orientation for user viewing of its display and illustrating a grip widthwise extent of maximum value;

FIG. 8 is a side view of the instrument of FIG. 1 showing an orientation for diagnostic viewing and a grip widthwise extent corresponding with that of FIG. 6;

FIG. 9 is a side view of instrument of FIG. 1 showing a display orientation for viewing of a display by a diagnostician and having a grip widthwise extent corresponding with that of FIG. 7;

FIG. 10 is a block diagrammatic drawing of the circuit employed with the apparatus of FIG. 1;

FIG. 11 is a flow chart describing the start up components of the program of the instrument of FIG. 1 as well as a configuration routine;

FIGS. 12A and 12B combine as labeled thereon to provide a flow chart of a maximum grip test diagnostic procedure;

FIG. 13 is a flow chart illustrating a rapid exchange diagnostic procedure;

FIGS. 14A-14C combine as labeled thereon to illustrate a flow chart describing a therapeutic fixed exercise regimen carried out by the instrument of FIG. 1;

FIG. 15 is a flow chart demonstrating the technique by which a score value is developed by the apparatus of the invention;

FIGS. 16A-16E are a sequence of displays provided by the instrument of the invention showing a publication of score, a dynamic bar graph with center pointer and a time remaining cue;

FIGS. 17A-17C combine as labeled thereon to illustrate a flow chart of a step therapeutic exercise which may be carried out with the instrument of the invention;

FIG. 18 is a flow chart showing an intentional power off sequence; and

FIG. 19 is a flow chart describing the applicability of the use of isometric exercise in conjunction with safe muscle strengthening and therapy protocols for a broad range of muscle groups.

FIG. 20 is a flow chart describing the interrelationship between mean arterial pressure, tissue pressure, perfusion pressure, heart rate, wall shear stress and nitric oxide levels.

DETAILED DESCRIPTION OF THE INVENTION

One or more specific embodiments of the present invention will be described below. In an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

One aspect of the present invention includes a system and method of using isometric exercise to treat various conditions, including erectile dysfunction, type 2 diabetes, and obesity. In general, the system includes applying a force to an isometric exercising mechanism via an elected exercisable muscle group of the musculature of a user. The mechanism is responsive to the force applied, and the application of force increases shear stress on a blood vessel wall of the user. This induces the immediate release of increased amounts of NO, and the increased synthesis of endothelial nitric oxide synthase, which results in longer term increased synthesis of NO in the user, thereby increasing the amount of bioavailable NO in the user. In certain embodiments, through the selection of the particular muscle group used, or through the particular exercise protocol, or any combination, a therapy for a particular condition (e.g., ED, obesity, or diabetes) may be provided.

Another aspect of the present invention provides an apparatus for carrying out a controlled isometric regimen by a user. In one exemplary embodiment, the apparatus may include a handgrip-based dynamometer. Being microprocessor driven, the instrument is programmed to carry out established diagnostic as well as newly developed grip-based isometric regimens. When employed for carrying out a diagnostic maximum grip test, the diagnostician selects configuration parameters and the instrument provides both visual and audible prompts and cues throughout the procedure. Maximum grip forces for each of the sequence of trials of this procedure are selected typically by the diagnostician and when so selected are recorded in instrument memory along with calendar data, and processor computed values for average grip force, standard deviation of the force values throughout a sequence of tests and corresponding coefficients of variation. At the termination of the diagnostic procedure, memory recorded test data are displayable to the diagnostician and may be downloaded through a communications port to a computer facility.

The isometric exercise apparatus under which the methodology of the invention may be carried out is lightweight, portable, battery powered and sufficiently rugged to withstand the compressive pressures which it necessarily endures during use. The instrument is programmable such that it may be utilized by a therapeutic practitioner for diagnostic purposes employing established grip test modalities. Strength measurements carried out during these modes are compiled in memory and the practitioner is afforded calculated values for average grip force, standard deviation and coefficient of variation with respect to grip force trials. Furthermore, individual strength measurements compiled in these averages, whether taken rapidly or slowly, are stored in memory and may be reviewed by the therapist.

Additionally, the instrument is employable as a therapeutic device. First a protocol is nominated by prescribing nominal parameters of the effort. Each isometric regimen is controlled initially by requiring that a maximum grip strength be established for each individual patient or user. Then, the practitioner may elect parameters of grip force and timing under mandated memory contained parameter limits. Accordingly, the user will be unable to carry out strength enhancement therapies which would otherwise constitute an excessive grip force regimen. For carrying out the noted diagnostic procedures as well as therapy activities, the grip widthwise extent is variable from 1.875 inches to 2.875 inches, such variation being adjustable in ½ inch increments. This is in keeping with standardized diagnostic practices. Further with respect to diagnostic procedures, the display or readout of the instrument can be adjusted with respect to the grip structuring such that only the practitioner or therapist may observe the data which is being developed during a diagnostic protocol.

Looking to FIG. 1, the instrument or apparatus is represented generally at 10 as having a housing identified generally at 12. Housing 12 is formed of acrylonitrile butadiene styrene (ABS) and, thus, is resistant to impact phenomena and the like. FIG. 1 shows that the housing 12 includes a hand grasping portion 14 and an integrally formed interacting portion 16. Interacting portion 16 supports a readout assembly 18 which is configured as an elongate liquid crystal display (LCD). Additionally located at the interacting portion are two finger actuable switches represented generally at 20. Of these switches, switch 22 is designated as a “menu” switch, while switch 24 is designated as a “select” switch. Note that the readout assembly 18 is angularly oriented with respect to the grip axis 26 of the apparatus 10. With this configuration, the user may observe prompts and cues appearing at the readout 18 as represented by the symbolic user eye station 28 and line of sight represented symbolically at arrow 30. In this regard, note that the hand 32 of the user is grasping the hand grasping portion 14. For the arrangement shown, the hand grasping portion 14 is represented as exhibiting its largest widthwise extent, i.e., 2⅞ inches. To gain this larger widthwise extent, auxiliary grip components 34 and 36 are employed in conjunction with the hand grasping portion 14. These auxiliary grip components will be seen to be removable as well as universally positionable so as to provide the noted widthwise adjustments in ½ inch increments.

Referring to FIG. 2, the instrument 10 is shown as it is employed for diagnostic activities. For this purpose, the auxiliary grip components 34 and 36 as seen in FIG. 1 have been reversed in their orientation at hand grasping portion 14. Note, additionally, that the symbolic eye station at 38 is now that of the diagnostician with a line of sight as represented symbolically at arrow 40 addressing the readout 18 (not shown). Note that the line of sight 40 is directed toward the auxiliary grip component 36 and the data readout for diagnostic purposes is not visually available to the user whose hand is represented at 32. Seen additionally in FIG. 2 is a serial communications port 40 and a battery compartment access cover 42. The serial port offers, for diagnostic purposes, the instantaneous transfer of real-time data to remote monitoring and data archiving equipment.

Looking to FIG. 3, an exploded perspective view of the apparatus 10 is provided. In the figure, the grasping portion 14 is seen to be comprised of two mirror image sides 52 and 54. Integrally molded with the sides 52 and 54 are the two housing components of the interactive portion 16 as shown respectively at 56 and 58. Plastic inserts or plugs are shown at 60 and 62 which are insertable within respective screw cavities 64 and 66. Extending from grasping portion side 54 is an integrally molded screw receiving post 68. In similar fashion, screw receiving post 70 is integrally formed with and extends from component 58. Additionally, a screw receiving post 72 extends from component 58. Post 72 receives a screw inserted through a battery cavity 74 inwardly disposed from cover 42. Post 72 additionally functions to contribute to the support of a printed circuit board 76 by virtue of its insertion through an aperture 78 formed therein. Note that the printed circuit carrying board 76 also supports communications port 40. In this regard, the port 40 extends into a rectangular opening 80 formed within interactive portion 58 of housing 12. Further extending inwardly from component 52 are two force plate support plates 53 and 55

Disposed centrally within the cavity defined by gripping portion sides 52 and 54 is a steel thrust plate 82 having a thickness and rigidity elected to withstand compressive gripping forces which may range, for example, up to about 205 pounds. Plate 82 is configured with two holes 81 and 83 which are used to restrain the plate from disengaging from the assembly when fitted over respective posts 53 and 55. Elongate side 84 of thrust plate 82 is configured for insertion within an elongate groove 86 of a base grip component 88. Grip component 88 is formed of a rigid plastic and includes an outwardly disposed base grasping surface 90 upwardly located in adjacency with the grasping surface 90 is one component of a base connector assembly represented generally at 92 and which is seen to be integrally molded with the grip component 88 and incorporates a slot or opening 94 in conjunction with a tab receiving trough 96. A tab component (not shown) of the base connector assembly feature of the base grip component 88 will be seen to extend from the end thereof opposite connector assembly component 92.

Two oppositely disposed edge extensions 98 and 100 of the trust plate 82 are configured for operative association with a load cell assembly represented generally at 102. Load cell assembly 102 includes an elongate steel base 104 incorporating two slots for receiving extensions 98 and 100, one such slot being revealed at 106. Connection between the base 104 and thrust plate 82 is provided by pins (not shown) which extend through mated bores 108 and 110 and 112 and 114. The load cell assembly 102 further includes an elongate outer force component 116. Two field plate-form load cells 118 and 120 are mounted from load cell mount structures shown, respectively at 122 and 124 formed within base 104. Such mounting is in cantilever fashion, the load cell 118 being attached to mount 122 by a screw and mounting plate assembly 126. Similarly, load cell 120 is attached in cantilever fashion to mount structure 124 by a screw and mounting plate assembly 128. Outer force component 116 is seen to have a centrally disposed rectangular post portion 120 which is attached by a connector plate assembly to the mutually inwardly extending ends of the load cells 118 and 120. the attachment plate assembly for this union is seen in general at 132. Assembly 132 is seen to be formed of two plate components 132 a and 132 b coupled, in turn, to load cells 120 and 118. Screws are used to effect the attachment.

The base grip component positioned oppositely of base grip component 88 is shown at 134. In similar fashion as component 88, the base grip component 134 is configured with a base connector assembly having one component at 136 which incorporates a slot and trough (not shown) in similar fashion as described at 92 in connection with component 88. a tab protrusion of generally cylindrical configuration shown at 138 is disposed oppositely from connector assembly component 136. The rigid plastic base component 134 is attached to elongate outer force component 116 of the load cell assembly 102. This attachment is provided by the insertion and crimping of two posts 134 a and 134 b (FIG. 4) within respective holes 117 and 119 formed within force component 116. a slot in component 1134 is provided to positively locate it onto the outer profile of component 116. In general, posts 134 a and 134 b (FIG. 4) are inserted through holes 117 and 119 and then melted with a hot iron to mechanically secure the two pieces 134 and 116 together as one sub-assembly. With the arrangement shown, gripping compressive force is asserted from the base component 188 through the thrust plate 82 into the load cell assembly 102. This force is counteracted by gripping force asserted from base gripping component 134.

Auxiliary grip component 34 is shown in the figure in spaced adjacency with respect to the base grip component 134. Auxiliary component 34 is configured with an outwardly disposed auxiliary grasping surface of generally half cylindrical cross section with a grasping surface profile curved concavely outwardly, for example, at region 140. This curvature is provided for enhancing grip contact with the palm of the user hand and for applying force centrally to the load cell assembly. Component 34 is formed with an auxiliary connector assembly which includes a flexible engaging tab 150 configured for insertion within the connector component 136 of base grip component 134. Connection at the opposite end is provided by a curved slot (not shown) which receives the tab protrusion 138 of base grip component 134. The connector assemblies are universal such that each of the auxiliary grip components may be mounted upon either of the base grip components 88 or 134. In this regard, not that a similar flexible engaging tab 152 is positioned upwardly upon auxiliary grip component 36. Similarly, the component 36 is configured having a curved slot 154 at its opposite end which receives tabs, for example, as at 138. The mounting of either auxiliary grip component 36 or 34 will increase the widthwise extent of the grip by one half inch. Accordingly, with both auxiliary grip components installed, the widthwise extent of the grip is increased to 2⅞ inches.

Interacting region 16 also includes a top cover 156. Formed, as the other components, of ABS plastic, the cover 156 includes a rectangular bezel opening 158 within which the LCD 18 is positioned. Integrally formed with top cover 156 is a downwardly depending switch cover 160 through which two rectangular openings 162 and 164 are provided. The switching function 20 is mounted upon a separate circuit board 166 which is seen to carry two push actuated switches as earlier described at 22 and 24 and identified by the same numeration in the instant figure. Located over the switches 22 and 24 is a flexible polymeric cover 168 formed of a flexible polymeric material such as Santoprene, a thermoplastic elastomer marketed by General Polymers of Charlotte, N.C. Circuit board 166 is supported between two slots formed in the interior of side components 56 and 58, one of these slots is seen at 170. The LCD 18 is mounted upon a circuit board 172 supported in turn, from interactive components 56 and 58. A bus-type wiring harness electrically associates the switching function 20, LCS 18, load cell assembly 102, the battery within compartment 74 and the circuitry carried by circuit board 76.

A sectional view of the instrument 10 is provided at FIG. 4. In the figure, base grip component 88 is shown in conjunction with base connector assembly component 92. In that regard, the slot 94 again is revealed as well as the tab receiving trough 96. At the opposite end, the base connector assembly includes an outwardly extending arcuate tab 174. Auxiliary gripping component 36 is shown coupled to the base grip 88. Note that the auxiliary component 36 has a grasping surface 176, the profile of which is undulatory to provide a finger grasping configuration. This undulatory profile further functions to provide a finger grasping configuration which centers the gripping force on handle 88. The lower portion of the base grip component 88 is seen to be formed having an outwardly extending arcuate tab 174 which slideably nests within the corresponding arcuate slot 154 in auxiliary grip 36. The connector assembly for base grip component 134 is identical. In this regard, the component 134 includes an arcuate outwardly extending tab 138 and a slotted receiver 136 structured identically as that described at 92. Auxiliary grip component 34 is connected to base grip component 134 by sliding a protruding tab or tongue 138 into arcuate slot 178. Additionally, the flexible engaging tab 150 is shown extending through a slot in connector component 136.

FIGS. 5-7 illustrate variations of grip widthwise extent available for utilization of instrument 10 in conjunction with therapeutic protocols. In general, for such therapeutic protocols, the readout assembly 18 is arranged to face the eye station of the user. In FIG. 5, no auxiliary grip components are mounted upon either base grip component 88 or base grip component 134. Accordingly the widthwise extent of the grip is 1⅞ inch. Looking to FIG. 6, the palm engaging auxiliary grip component 34 is shown mounted over base grip component 134. The increases the widthwise extent of the grip for therapeutic applications to 2⅜ inches. FIG. 7 illustrates the utilization of both auxiliary grip components 34 and 36 to provide a grip widthwise extent of 2⅞ inches. As before, the auxiliary grip components are arranged such that the user may observe readout 18.

FIGS. 8 and 9 illustrate grip arrangements particularly suited for diagnostic purposes wherein the diagnostician has exclusive access visual to the readout assembly 18. In FIG. 8, base grip component 134 is combined with auxiliary grip component 34 to provide a widthwise grip extent of 2⅜ inches. Removal of the auxiliary grip component 34 returns the grip widthwise extent to 1⅞ inches.

In FIG. 9, both auxiliary grip components 34 and 36 are employed to provide a maximum widthwise grip extent of 2⅞ inches. It may be observed in FIGS. 8 and 9 that the positioning of the auxiliary grips is reversed in the sense of the grip configuration shown in FIGS. 5-7.

Turning to FIG. 10, a block diagrammatic representation of the controller components of instrument 10 is revealed. In general, the instrument 10 is microprocessor driven, for example, employing a type 8051 microprocessor as represented at block 180. The controller is powered by a standard 9 volt battery. That voltage then is regulated to 5 volts for use by the circuit components. A power supply to the strain gauge implemented load cells 118 and 120 is dropped by a resistor such that the maximum current applied is limited to 50 milliamps. Such power supply is represented in the figure at block 182 which, in turn, is seen to be associated with microprocessor 180 via line 184 and with switch 24 via lines 186 and 188. Note that switches 22 and 24 respectively are labeled “menu” and “select”. Switch 24 serves the additional function of an on switch or enablement switch. Power also is seen to be supplied to the communications connector 40 as represented at line 190. Communications connector 40, in turn, is seen coupled to a communications driver 192 as represented at line 194. Driver 192 associated with the microprocessor 180 as represented at line 196. The microprocessor 180 also provides control over an annunciator or buzzer as represented at block 198 and line 200. Similarly, control to the liquid crystal display (LCD) 18 from microprocessor 180 is represented at line 202. A real-time clock is provided with the controller circuit as represented at block 204. Time and date data from that clock are used in conjunction with the monitoring and memory features of the instrument 10 such that important data, including date and time of a given trial regimen can be retained in memory and downloaded via the communications port 40 when called for. The association of the real-time clock function 204 and microprocessor 180 is represented at line 206. Archival memory as well as temporary memory are provided with the controller. Archival memory may be provided, for example, as an electrically erasable programmable read only memory (EE PROM), an 8 kilobyte device which requires no power to sustain its memory retention, i.e., it is non-volatile. The archival memory is represented at block 208 and its association with the microprocessor 180 is represented at line 210.

Load cells 118 and 120 are represented with that numeration in FIG. 10. These load cells are each configured as a four resistance balance bridge-type load cell. The outputs of load cells 118 and 120 are directed to the amplification function as represented by respective lines 212 and 214 extending to amplifier block 216. The output of amplifier 216 is represented at line 218 extending to an analog-to-digital converter function represented at block 220. Correspondingly, output of the converter function 220 is directed to the microprocessor 180 as represented at line 222. Microprocessor 180 converts the signal to a force value in pounds or kilograms which is displayed in the LCD 18. The menu switch 22 is shown associated with microprocessor 180 via line 224, while the select switch 24 is associated with that processing function as represented at line 188.

Each of the instruments 10 is calibrated using nineteen combinations of six standard weights. A best fit is determined and the instrument is called upon to have a root mean square error (RMS) of 0.1 pounds or less to pass calibration requirements. Once the calibration constants has been determined, the system is loaded with two redundant copies of the calibration constants. The zero point of the load cell is monitored at all times during the use of the instrument 10. If a drift is found, then a warning is shown at the LCD display 18. If any lead wire to the load cell becomes disconnected, then the built-in monitoring detects this occurrence, shows an error message, and disables further use of instrument 10 until the power is reset. These features insure that the force reading shown is accurate and true. Absolute values of the outputs of load cells 118 and 120 are summed to provide a force output signal. In general, the load measurement accuracy of instrument 10 is better than 0.1 pound or 0.1% of applied force whichever is greater.

In the discourse to follow, the sequences of the program protocol carried out by instrument 10 are represented in flow chart fashion. In general, these flow charts commence with a configuration sequence if desired and then look to two diagnostic protocols followed by two therapeutic protocols.

Turning to FIG. 11, the procedure seen to commence as represented at block 230 with the selection of the grip widthwise extent. In general, that grip width is elected to accommodate variations in user hand sizes. The program then continues as represented at line 232 and block 234 wherein, where appropriate, one or two auxiliary grip components as at 34 and 36 are installed in an orientation providing for user viewing of display 18 as illustrated in connection with FIG. 1, or in an arrangement for therapeutic practitioner viewing to the exclusion of the user as described in connection with FIG. 2. The program then continues as represented at line 236 and block 238 providing for the enablement of instrument 10 by actuation of select switch 24. Upon such actuation, as represented at line 240 and block 242 a start-up message is provided at display assembly 18 for an interval of two seconds. Then, as represented at line 244 and block 246 a prompt is displayed at readout 18 identifying a default configuration wherein pounds as opposed to kilograms are elected; an audible tone is enabled, and for a diagnostic test referred to as “rapid exchange” wherein instrument 10 is passed from one hand of the user to the other and then back for a number of exchanges, the user providing a grip force trial at each exchange. The rapid exchange default values are ten exchanges with 1.5 seconds available for user gripping or squeezing. Following the publication of the screen as represented at block 246, should the user not actuate either the switches 22 or 24, then as represented at line 248 and block 250 the instrument 10 will turn off or power down at the end of a five minute interval. This feature is always active, i.e., turning off five minutes after a last switch actuation.

With the publication of the screen as represented at block 246, then as represented at line 252 and block 254 the practitioner or user is called upon to determine whether to enter a configuration sequence or to progress to a diagnostic grip test. To enter the latter diagnostic grip test sequence, as represented at line 256 and block 258 by pressing switch 24 display 18 will prompt the user to press the select switch 24 to commence a diagnostic grip test sequence. Where the select switch 24 is actuated, then the program enters the diagnostic grip test sequence as represented at line 260 and node A.

Where a determination on the part of the practitioner or user is made to enter a configuration sequence, then as represented at line 262 and block 264 the configuration sequence is entered by actuating switch 22. As represented at line 266 and block 268 the initial configuration looks to units. Recall from block 246 that the instrument 10 defaults to a units evaluated in pounds. As represented at line 270 and block 272 by actuating select switch 24 the units parameter can be converted to kilograms instead of pounds. The program then continues upon depressing or actuating menu switch 22 as represented at either lines 274 or 276 leading to block 278. As represented at block 278, the user then is given the opportunity to delete the audible tone. In this regard, by actuating select switch 24, as represented at line 280 and block 282, the tone is deleted, display 18 showing the term “tone” in connection with the letter N.

The configuration sequence then continues as represented at either lines 283 or 284 with the actuation of menu switch 22. This actuation of switch 22 provides for the establishing of a rapid exchange diagnostic test cycle time change. As set forth at block 286 the default cycle time is 1.5 seconds. However, by actuation of select switch 24, as represented at line 288 and block 290 the operator may change the cycle time to 2.5 seconds. The program then continues by actuating the menu switch 22 as represented at either of lines 292 or 294. These lines lead to the configuration alteration represented at block 296. Recall from block 246 that the default number of exchanges for the rapid exchange diagnostic procedure is 10.

However, as represented at line 298 and block 300 the operator may change the number of exchanges from 10 to 20 by actuation of select switch 24. The program then returns to line 244 by actuation of the menu switch 22 as represented at lines 302 and 304. As described in connection with block 258, line 260 and node A, the operator may elect to proceed with a diagnostic grip test.

Referring to FIG. 12A, node A reappears in conjunction with line 306 extending to the query posed at block 308 wherein a determination is made as to whether or not to enter a diagnostic grip test mode. Where the operator determines that the diagnostic grip test mode should be entered, then as represented at line 310 and block 312, the grip test mode is entered by actuating select switch 24. The operator is then prompted at display 18 to actuate select switch 24 to enter a max test mode. Accordingly, with the actuation of switch 24, as represented at line 314 and block 316 the maximum diagnostic grip test mode is entered. On the other hand, as represented at line 318 and node B by actuating the menu switch 22, the practitioner may cause instrument 10 to enter a rapid exchange sequence.

Returning to block 316, the maximum strength grip test can be carried out with 10 maximum squeezing force trials. At the conclusion of a given number of such trials, the practitioner actuates select switch 24, whereupon computations are carried out. Accordingly, as represented at line 320 and block 322 the user is prompted with the message “squeeze hard!!!” at the readout 18. The program will elect the highest force applied during such squeezing activity, whereupon the user releases the grip force as represented at line 324 and block 326. Then instrument 10 will publish the maximum force applied by the user as represented at line 328 and block 330, a first maximum grip evaluation being shown as an example as 64.4 pounds. Block 330 also indicates that the user is prompted to either actuate the select switch 24 to accept the published maximum squeeze evaluation as set forth at block 330 or to squeeze the grip 14 again. Such squeezing again will provide a substitute maximum grip force evaluation. Then, as represented at line 332 and block 334 the query is posed as to whether the select switch 24 has been actuated. In the event that it has not, then the program loops as represented at line 336 extending to line 320, whereupon a maximum grip effort again is undertaken. Where the operator elects the maximum first trial grip force evaluation, then as represented at line 338 and block 340, the program will compute an average of force values, standard deviation and coefficient variation, albeit it for one trial at this junction in the procedure.

The program then continues as represented at line 342 and block 344 to display computed values which, as noted above, for the first trial are irrelevant. However, as the number of trials increases, those computed values gain significance. Next, as represented at line 346 and block 348 the program commences to carry out a next maximum grip test by providing a prompt at readout 18 which advises the user to “squeeze hard!!!” and indicates that this is a second trial as represented by the terms: “MAX 2”. Following a squeezing of the grip region 14, as represented at line 350 and block 352 the user releases the grip force and, as represented at line 354 and block 356 the maximum force asserted by the user is published, for example, showing 60 pounds for a “MAX 2” trial. This prompt further advises the user to actuate select switch 24 to elect the published grip force value or to squeeze again to carry out a next trial. The program then continues as represented at line 360 and block 362 to determine whether or not select switch 24 had been actuated. In the event that it had not been actuated then the program loops as represented at lines 364 and 346 whereupon the user again may carry out the second maximum grip trial. Where switch 24 has been actuated, then as represented at line 366 and block 368, the program carries out a computation of the average of the maximum forces asserted and computes standard deviation and coefficient of variation which are submitted to memory. The program then continues as represented at line 370 and block 372 whereupon the values computed in connection with block 368 are published at display 18. The above maximum grip test trials may be reiterated for 10 trials. Accordingly, as represented at line 374 and block 376 the maximum test trials are reiterated for a total of N tests (10 maximum) and the computed values of average force, standard deviation and coefficient of variation are both submitted to memory and published at display 18. As represented at line 378 and block 380 the user may restart this max test sequence following the Nth trial by actuating select switch 24, whereupon the program returns as represented at line 382 to 310 (FIG. 12A). Returning to block 380, by actuating menu switch 22, as represented at line 384 and block 386, a subsequent actuation of select switch 24 will return the program to a previous menu. As represented at line 388 and block 390 by again actuating menu switch 22, as represented at line 392 the program reverts to node B as described in conjunction with FIG. 12A. By again actuating select switch 24, as represented at line 394 the program returns to entry into the maximum grip diagnostic test, line 394 extending to line 314 seen in FIG. 12A. This circular logic is made available at a variety of locations within the program.

Returning to FIG. 12A, where the query posed at block 308 results in a negative determination that the maximum grip test diagnostic mode is not to be entered, then, by actuation of menu switch 22, as represented at line 396 and block 398 a determination is made as to whether to exit a diagnostic mode and enter a therapy based mode. Where a therapy mode is not elected, then as represented at line 400 and block 402 a previous menu may be elected by actuating the select switch 24 as represented at line 404 and node D. By actuating menu switch 22, then as represented at line 406, the program loops to line 306 and the query posed at block 308. Where a therapy mode is elected by the user, then as represented at line 408, the program diverts to a therapy mode of performance as represented at line 408 and node E.

Looking back to the query posed at block 334, where the menu switch 22 is actuated as opposed to electing a maximum grip value, then as represented at line 410 and block 412 the program will reconfigure for restarting the grip test mode. Once at this point in the program as represented at block 412, by again actuating select switch 24, the program reverts as represented at line 414 to line 320 to carry out another maximum grip trial. On the other hand, where menu switch 22 is actuated, as represented at line 416 and block 418 an indication will be given to the operator that to elect previous menu, select switch 24 is to be actuated. As represented at line 419, the program then reverts to node C. Node C again appears in FIG. 12A in conjunction with line 420 extending to line 310. Where menu switch 22 is again actuated, the program reverts to block 412 as represented at line 422.

Looking again to FIG. 12B and the query posed at block 362, where the second maximum grip test is not selected by menu switch 22 is actuated, then as represented at line 424 and block 426 the program enters a mode for restarting the maximum grip test. By again actuating menu switch 22, as represented at line 428 and block 430 the user is prompted to enter the previous menu position in the program by actuating the select switch 24. Accordingly, by actuating switch 24 as represented at line 432, the program reverts to node C. Returning to block 426, where the select switch 24 is actuated, then the program loops as represented at line 434, to line 346 to again undertake the second of the maximum grip tests. By actuating menu switch 22 from the program location of block 430, as represented at line 436 the program reverts to its position at block 426.

The diagnostic performance mode of the instrument 10 also provides for the carrying out of a rapid exchange (RE) test. With the rapid exchange test, the user may grip instrument 10 in the manner shown in FIG. 2 such that the therapist or practitioner may observe readout 18 to the exclusion of the user or patient. With the rapid exchange, a maximum grip force is exerted by the user or patient in exchanging between the right and left hands under a controlled exchange timed cycle which will have been elected, for example, in connection with the configuration mode described in connection with FIG. 11. It may be recalled that the number of exchanges may also be elected by the diagnostician as 10 or 20 efforts or trials. The rapid exchange mode of performance is elected as represented at block 312 and line 318 extending to node B described in connection with FIG. 12A. Node B reappears in FIG. 13 in association with line 440 and block 442. Referring to that figure, block 442 is seen to provide for a prompt to the practitioner to actuate select switch 24 to enter the rapid exchange mode. Upon actuating switch 24, as represented at line 444 and block 446 a prompt is provided at readout assembly 18 advising the user to squeeze the grip 14 with the right hand to start the rapid exchange sequence. As represented at line 448 and block 450 the program awaits the presence of a right hand squeezing force. Until that squeezing force is asserted, the program dwells as represented at loop 452 extending to line 444. Where a squeezing force is detected, then as represented at line 454 and block 456 the program commences to time out the succession of periods or time-hacks allocated for this cycle of the rapid exchange diagnostic procedure. That time interval may have been elected in the configuration mode as described in conjunction with blocks 286 and 290 (FIG. 11). For example, the cycle time, T_(r) has a default value of 1.5 seconds or the last value selected.

As represented at line 458 and block 460 the user will have squeezed the grip region 14 and the maximum hand force value evolved will be submitted to memory. Then as represented at line 462 and block 464 a determination is made as to whether the menu switch 22 has been actuated. In the event that it has not, as represented at line 466 and block 468 the program determines whether the Nth, i.e., 10^(th) or 20^(th) trial has been completed. In the event that it has not, then as represented at line 470 and block 472 the rapid exchange test has not been completed and an audible tone cue (time hack) is provided indicating that the instrument should be switched to the opposite hand. A short dwell occurs as represented at line 474 and block 476 wherein the instrument determines whether or not a squeeze force has been asserted. In the event that it has not, then the program loops as represented at line 478. Where the user has imparted a squeezing force to the instrument, the program continues or loops as represented at line 480 extending to line 458 leading to a next trial in an alternate hand.

Returning to block 464 where menu switch 22 is actuated in the course of carrying out rapid exchange trials, an affirmative determination will be made with respect to the query posed at that block. Accordingly, as represented at line 482 and block 484 the user is prompted to restart the rapid exchange test by actuating select switch 24. Where select switch 24 is actuated, then as represented at line 486 the program reverts to line 444 and block 446. On the other hand, where menu switch 22 is actuated, then as represented at line 488 and block 490 the user is prompted to revert to the previous menu by actuating select switch 24. Where select switch 24 is so actuated, then the program reverts to node C as represented at line 492. Note, additionally, that if menu switch 22 is actuated in conjunction with the prompt provided at block 442, then as represented at line 494 the program reverts to line 488. Returning to block 490, where menu switch 22 is actuated then as represented at line 496 and block 498 the program computes and displays the overall average of the maximum trial values, standard deviation and coefficient of variation for the N trials. That data is submitted to memory. Should menu switch 22 be actuated at this juncture, then as represented at lines 500 and 482, the program returns to block 484. Where the select switch 24 is actuated, however, as represented at line 502 and block 504 the maximum force value for trial N and the average SE and CD for all trials is displayed. On the other hand, where the menu switch 22 is actuated, then as represented at lines 506 and 482, the program reverts to block 484.

Where the select switch 24 is actuated repetitively, then as represented at line 508 and block 510 the succession of trials 1 through N is displayed. Additionally, the unchanging average for all those trials is displayed for convenience. Further, a query is posed as to whether the Nth trial has been displayed. Where it has not, then the display program loops as represented at line 512 extending to line 502. On the other hand, where the Nth trial has been displayed, then as represented at line 514, the program loops to line 502 to repeat the succession of displays.

It may be recalled that in conjunction with block 398 in FIG. 12A, a therapy mode may be entered by actuation of select switch 24 as discussed in connection with line 408 and node E. Node E reappears in FIG. 14A in conjunction with line 520 and block 522. Block 522 indicates that the readout 18 will publish information that a grip therapy is available by actuation of select switch 24. It may be recalled that the parameters of time and force are somewhat pre-established under the regimen of the instant program. In this regard, it is important that the isometric grip exercise be constrained within predefined force and time interval of holding and resting limits. These parameters are nominated in the program and while some variations are permitted, those variations are retained within physiologically determined limit values. Of importance to the grip therapy at hand, it may be observed that it is predicated upon the patient or users actual and unique the maximum gripping force which initially is evaluated and then treated by a preordained but still electable target valuation. In general, the prompt and cues provided at display 18 are made available to the patient or user by a handle configuration as described in conjunction with FIG. 1. Looking to FIG. 14A, block 522 provides for a display at readout 18 indicating that a grip therapy mode is available by actuation of select switch 24. As represented at line 524 and block 526 a determination is made as to whether a fixed mode of therapy or a stepped mode of therapy is to be elected. A fixed therapy is elected by actuation of select switch 24 as represented at line 527 extending to block 528. Block 528 indicates that the fixed exercise configuration mode has entered. With such entry, as represented at line 530 and block 532 readout 18 prompts that the user will be given opportunities to adjust the target load factor, the number of repetitions of trials of the grip therapy, the duration of the holding of the grip force at a target value and the interval for a intergripping rest. However, as an initial component of the procedure, the maximum grip force value for a given patient is determined. Accordingly, upon actuating switch 24 as represented at line 534 and block 536 the user is prompted to squeeze the grip with maximum force by publishing the terms: “squeeze hard!!!”. Then, as represented at line 538 and block 540, the squeeze generated load or force value is outputted to the microprocessor 180 (FIG. 10). The maximum valuation of this initial force evaluation then is displayed at readout 18 as represented at line 542 and block 544. In the latter block, it may be observed that a sample force valuation of 90.3 pounds is published at readout 18. The user can elect that valuation as the maximum force value to be used in the program by actuating select switch 24 as represented at line 546 and block 548. However, a prompt at readout 18 also provides that the user may retry this maximum grip force evaluation as represented at loop line 550 extending to line 538. Where the user or therapist determines that an appropriate grip force has been derived, then as represented at line 552 and block 554 the elected maximum force value is submitted to memory and the program continues as represented at line 556 and block 558. employing the elected maximum squeeze force, the program computes a target grip force using a default factor of 50%. Additionally, the program establishes a trial repetition number at a default number of 4; a hold on target force interval of 45 seconds; and a default rest interval of 120 seconds. As represented at line 560 and block 562 the computed target level then is displayed at readout 18 along with the value of the elected maximum grip force and the default target factor of 50%. The terms “Target 45lb” blink as a prompt that the factor can be altered within an established range. The user or practitioner then is given the opportunity to adjust the target factor percentage in 10% increments from 10% to 100% as represented at line 564 and block 566 by actuating the menu switch 22. Next, as represented at line 568 and block 570 the program computes at a new target value based upon the elected factor, an arbitrary designation “AA” being shown. A lower enabling grip force threshold also is derived. Should the user elect a target factor other than the 50% value by adjustment in connection with block 566, the program will automatically nominate hold on target intervals and rest intervals for each available 10% selection from within the range from 10% to 100% which the user may have elected. This, again, is for the purpose of protecting the user from excessive effort intervals and inadequate rest intervals. However, still within the mandated overall ranges, the user or therapist can change those values for the hold on target effort and rest effort. The nominated hold or “Effort” and rest intervals contained in the program are summarized in Table 1 below.

TABLE 1 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Max Max Max Max Max Max Max Max Max Max 120 120 90 60 45 15 12 10 5 3 sec. sec. sec. sec. sec. sec. sec. sec. sec. sec. Effort Effort Effort Effort Effort Effort Effort Effort Effort Effort 60 120 120 120 120 120 120 60 60 60 sec sec sec sec sec sec sec sec sec sec Rest Rest Rest Rest Rest Rest Rest Rest Rest Rest

Following the target load computation, as represented at line 572 and block 573 the program displays the newly computed target force value at readout 18 along with the default values for number of repetitions (which defaults at 4), and the nominated hold on target interval and the rest interval (Table 1). As a prompt, the readout “4 REP” blinks to indicate that adjustment is available to the user. The program then continues as represented at line 574 which reappears in FIG. 14B extending to block 576 which provides for adjusting the number of repetitions between the values 1 and 10 by actuating menu switch 22. Note that the maximum number of repetitions made available to the user is 10. The program then continues by actuating switch 24 as represented at line 578 and block 580 indicating that the computed target force level (AA) and the newly elected repetition number herein represented as “B” is provided at the display along with the nominated values for hold on target interval (CCC) and rest interval (DDD). In this display, the terms: “CCC HOLD” blink to prompt the user to make any desired adjustments within the mandated limits of from 5 seconds to 120 seconds. Accordingly, as represented at line 582 and block 584 the user or practitioner may adjust the hold on target interval by actuating menu switch 22. When the desired hold on target interval has been displayed at readout 18, the select switch 24 is actuated and the program progresses as represented at line 586 and block 588 to provide a display at readout 18 which indicates the computed target force level AA; the elected repetition number (B) and the elected hold on target interval (CCC). The display also will blink the terms “DDD REST” to prompt the user to adjust the rest interval to a desired value within the mandated interval range of 10 seconds to 120 seconds. Accordingly, as represented at line 590 and block 592 the user or practitioner can adjust (by decade components) the extent of the rest interval by actuating menu switch 22 until a desired interval value is displayed. Once the desired interval is so displayed, an actuation of select switch 24 will enter it into memory. Next, as represented at line 594 and block 596 the program displays the now elected values including the target force (AAIb); repetitions (B REP); the hold on target interval (CCC); and the rest interval (DDD). The program then provides a prompt to the user to start the therapy by actuating the select switch 24 as represented at line 598 and block 600. Upon such actuation of switch 24, as represented at line 602 and block 604 the program prompts the user at readout 18 to apply a gripping force at the target level along with the further prompt “squeeze”. Next, as represented at line 606 and block 608 the program determines whether the grip force applied by the user is within 10% of the computed target force value (AA). This is the lower threshold determination as described in conjunction with block 570. In the event that the applied gripping force is not within 10% of the computed target value, the program loops as represented at line 610 extending to block 604 providing for a continuation of the prompt to hold on target. Where the applied grip force is within 10% of the computed target force value, then as represented at line 612 and block 614 the program commences to time out the hold on target interval previously elected or nominated (CCC) as discussed in connection with block 584. While this hold on target force interval is underway, as represented at line 616 and block 618 a dynamic comparison value computation is carried out over a sequence of short time components within the hold time out interval. That comparison value is utilized in driving a bar graph form of display functioning to cue the user as to a proper grip force level. During this hold interval, as represented at line 620 and block 622 the program also compares the applied grip force with a force upper limit which is computed as 125% of the target force. In the event that the applied grip force is above that upper limit, then as represented at line 624 and block 626 an audible cue is sounded to warn the user that excessive force is being applied which is outside the proper protocol for the therapy. The program then continues as represented at lines 628 and 630 whereupon as set forth at block 632 a score as a percentage of target value is computed for a sequence of time increments. This score may be utilized by the user and the therapist for purposes of evaluating the quality of the exercise regimen carried out by the user.

Turning momentarily to FIG. 15, a routine is depicted functioning to carry out the computation and display of the noted score values. This routine is entered into as represented at node 634 identifying it as a display of the score value. The routine commences as represented at line 636 and block 638 indicating that the currently applied grip force or load value is read as the user attempts to match the target force value. Then, as represented at line 640 and 642, the score is determined by dividing that read force by the pre-computed target force and multiplying the result by 100 to provide the score as a percent. This score is developed for sequential increments of time, preferably each increment representing 1% of the hold on target interval (CCC). As represented at line 644 and block 646, the score is converted into three display characters. Then, as represented at line 648 and block 650, three characters representing the score are sent to readout 18 for display. The score may be above or below 100%, 100% representing an on target grip force.

Returning to FIG. 14B, the program continues as represented at line 652 which reappears in FIG. 14C extending to block 654. Block 654 indicates that a display is provided at readout 18 which cues the user as to essentially instantaneous score value, the time remaining for holding on target and further cues the user as to the level of grip force being applied with respect to target through the utilization of a center pointer visual cue representing the target load value and an effort dynamic bar graph visual cue having a top position present as a bar graph top line. That top line will be aligned with the center pointer when the load value at output represents a force equal to the target load value. The top line will move away from the center pointer when the load value output or grip force exerted by the user represents a force which deviates from the target load value.

Looking momentarily to FIGS. 16A-16E, a representation of the display so provided for differing grip force activity is set forth. In FIG. 16A, the dynamic bar graph extends to the right of the center pointer indicating a grip force which is too low. This lower grip force also is indicated by the lower score value of 62%. The display also includes an indication of the time remaining for the hold on target interval, for example, 100 seconds. FIG. 16B also indicates through the dynamic bar graph that the asserted grip force is still too low but improved over that shown in FIG. 16A as indicated by the shorter extent of the dynamic bar graph to the right of the center pointer and a higher score value of 75%. FIG. 16C shows a cue wherein the user grip force is at the target force, the top line of the bar graph being aligned with the center pointer and a score of 100% being displayed. Additionally, as before, the time remaining for the hold on target interval is displayed. FIG. 16D shows that an excessive grip force is being applied by the user, the dynamic bar graph extending to the left of the center pointer. This excessive force also is indicated by a score value of 125%. Time remaining in seconds within the hold on target interval also is displayed. Finally, FIG. 16E shows a still more excessive application of grip force on the part of the user, the dynamic bar graph top line extending well to the left of the center pointer and a score of 137% being represented. As before, time remaining in the “on target interval” is also displayed.

Returning to FIG. 14C the program is seen to continue as represented at line 656 and block 658 wherein a query is made as to whether the hold on target interval has timed out. In the event that it has not, then the program dwells as represented by loop line 660 extending to node I which reappears in FIG. 14B with line 662 extending to line 620. In the event of an affirmative determination with respect to the query posed at block 658, then as represented at line 662 and block 664 an audible cue is generated at the annunciator 198 (FIG. 10). With the generation of this audible cue, then as represented at line 666 and block 668 the rest interval commences to be timed out. It may be recalled that the rest interval was elected in conjunction with block 592 (FIG. 14B). during this rest interval, as represented at line 670 and block 672 the program will provide a display at readout 18 which indicates the number of trials or efforts remaining in conjunction with the elected repetition value. At the termination of the first trial, that value will be B-1. The display also provides the average value of score and the interval of time remaining in the rest interval. Next, as represented at line 674 and block 576 a query is made as to whether the rest interval has timed out. In the event that it has not, then the program dwells as represented at loop line 678. Where the query posed at block 676 results in an affirmative determination, then as represented at line 680 and block 682 an audible cue is generated and the program continues as represented at line 684 and block 686 providing for a reiteration of the trial sequence. As represented at line 688 and block 690 a query is made as to whether the elected number of repetitions of the trial (B) has been accomplished. In the event that that elected number of repetitions has not been completed, then the program dwells as represented at line 692. In the event of an affirmative determination with respect to the query posed at block 690, then as represented at line 694 and block 696 a final or average score is computed and submitted to archival memory in conjunction with calendar and force data. In the latter regard, each of the average grip force values asserted by the user for each trial are recorded. Next, as represented at line 698 and block 700 the program determines or selects an appropriate message of congratulation or warning base upon the computed final score. The program then continues as represented at lines 702 and block 704 to publish the selected message at readout 18 and continues as represented at line 706 to node G.

Node G reappears in conjunction with line 708 (FIG. 14A) and block 526. Where the user or therapist has determined to cause instrument 10 to enter into a stepped therapy mode, menu switch 22 is actuated as represented at line 710 and the program displays a prompt to the user as represented at block 712 indicating that the step therapy mode may be entered by actuating select switch 24 as represented at line 714 and node F.

Referring to FIG. 17A, node F reappears in conjunction with line 716 and block 718 providing for the entry of instrument 10 into a stepped exercise configuration mode. In this therapeutic mode the maximum grip strength unique to the user or patient is determined, whereupon the therapeutic gripping regime is one wherein the target load level as well as hold on target intervals and rest intervals vary in accordance the sequence of steps or gripping trials. The program opens as represented at line 720 and block 722 with a display at readout 18 prompting that the user is to be called upon to establish a maximum grip force level and carry out a setting of the number of steps and repetitions of the therapy. The user then actuates the select switch 24 and, as represented at line 724 and block 726 the program displays a prompt at readout 18 indicating that the user should carry out a maximum grip force exercise, the prompt including the terms; “squeeze hard!!!”. Then, as represented at line 728 and block 730 the user will have applied maximum squeezing force to the grip and that will have generated a load value output. While this load value output is being generated, as represented at line 732 and block 734 the program displays a cue at readout 18 which publishes the value of the maximum gripping force. Should the practitioner or user wish to attempt to improve that value, he or she is prompted to actuate select switch 24 and elect the value published or to squeeze the grip again. Where the user elects the value published, then as represented at line 736 and block 738 a determination is made as to whether the select switch 24 has been actuated. In the event that it has not, then the system dwells as represented at loop line 740 extending line 728. Where the select switch 24 has been actuated, then as represented at line 742 and block 744 the maximum gripping force value which was selected is submitted to memory and, as represented at line 746 and block 748 the system provides a 1 step default value and a repetition of the step exercise is defaulted to a value of four. The program then continues as represented at line 750 wherein the system provides a prompt at readout 18 which displays the value of a selected maximum gripping force and further prompts the user that a default of 1 step is present and a default of four repetitions is present.

The term “1 step” is intermittent or blinks as a part of this prompt to the user to elect the number of steps desired. This display is represented at block 752. Then, as represented at lines 754 and block 756 the user or practitioner is permitted to adjust the number of steps within a range of 1 to 5 steps. As discussed above, this range is mandated within the system and the adjustment in the number of steps may be carried out by actuating menu switch 22.

The number of steps elected adjusts the percentage of maximum grip force factor in accordance with a preordained schedule. That schedule is provided in Table 2 below. For example, if only one step is elected, that target grip factor will be 20%. On the other hand if five steps are elected, the first trial will be at 100% of maximum grip force. The second step will be at 80% of maximum grip force and so forth. On the other hand, if four steps are elected, the initial trial will be in conjunction with an 80% maximum grip force factor; the second step will be at 60% and so forth as set forth in Table 2. For each of these percentages as set forth in Table 2, the corresponding hold on target or effort interval and rest intervals will follow the values given above in Table

TABLE 2 No. of Steps Elected 1 2 3 4 5 1^(st) Step as % Max 20% 40% 60% 80% 100%  2^(nd) Step as % Max 20% 40% 60% 80% 3^(rd) Step as % Max 20% 40% 60% 4^(th) Step as % Max 20% 40% 5^(th) Step as % Max 20%

The step value is elected by actuation of select switch 24 and the program continues as represented at line 758 and block 760. Block 760 replicates a display at readout 18 which prompts the user by indicating that the maximum elected gripping force selected was 90 pounds and that A steps were selected and a further prompt is provided showing blinking or intermittent display of “4 REPS”. Then, as represented at line 762 and block 764 the operator may adjust the number of repetitions of the program to a value within a preordained number of 1 through 10 by actuating menu switch 22. The elected number of repetitions then is selected by actuation of switch 24 and, as represented at line 766 and block 768 the system displays the now selected parameters of a maximum grip force, for example, 90 pounds, an election of A steps in the regimen and an election of “B” repetitions. Next, as represented at line 770 and block 772 the stepped exercise therapy is entered. Upon entry into this stepped exercise trial mode, target values are computed based upon the number of steps elected and the hold on target and rest intervals will be acquired, such data with respect to target factors being set forth in Table 2 and the latter hold on target and rest intervals being set forth in Table 1. This function is represented in block 776. Line 778 reappears in FIG. 17B extending to block 780 which prompts the user with a display indicating that to start the step therapy the select switch 24 should be actuated. The operator may return the system to a previous menu at this juncture by actuating menu switch 22. In this regard, as represented at line 782 and block 784 by actuating switch 22, the program will again display that initially elected maximum 90 pound grip force along with the prompt to squeeze again or press select as represented at line 785 and node K. This returns the program to block 752 (FIG. 17A) where node K reappears at line 750. While again actuating switch 22, as represented at line 786 and block 788 a restarting of the step therapy test prompt is provided advising the user to actuate switch 24. Again where switch 22 is actuated, then as represented at line 790 and block 792 the user is provided a prompt display at readout 18 advising that the previous menu may be elected by actuating select switch 24. Where that switch is actuated, then as represented at line 794 and node H the program returns to block 712 as earlier described in connection with FIG. 14A. In this regard, node H reappears in that figure in conjunction with line 796 extending to block 712. Where menu switch 22 is actuated the program loops as represented at line 795 extending to line 782.

Returning to block 780, where switch 24 has been actuated, then as represented at line 798 and block 800 the user is prompted to hold the grip force at the computed target level for 100%. Additionally, the prompt term “SQUEEZE” is provided within the readout 18. Next, as represented at line 802 and block 804 a determination is made as to whether the grip force exerted by the user is within 10% of the computed target value. Where it is not, then the system dwells as represented at loop line 806 and the display represented at block 800 continues. Where the asserted grip force is within 10% of the target load, then as represented at line 808 and block 810 the mandated hold on target interval timeout set forth in Table 1 commences and, as represented at line 812 and block 814 a dynamic comparison value is derived for dynamic bar graph cueing. Next, as represented at line 814 and block 816 a computation then is made as to whether the instantaneous grip force is at or above 125% of the target value. Where that is the case, then as represented at line 820 and block 822 an audible warning cue is sounded. The program then continues as represented at lines 824 and 826 when the excessive force has been lessened. Line 826 is directed to block 828 which provides for carrying out a computation of a score value as a percentage of target for a sequence of time increments. Computation of this score has been discussed in connection with FIG. 15. The program then continues as represented at line 830.

Line 830 reappears in FIG. 17C extending to block 832 which provides a display at readout 18 with essentially instantaneous score values, the noted dynamic bar graph and hold time remaining for the initial step at hand. The dynamic bar graph has been described in conjunction with FIGS. 16A-16E. Next, as represented at line 834 and block 836 a query is posed as to whether the hold time interval has expired. Where it has not, then the system dwells as represented at loop line 838 extending to node J. Node J reappears in FIG. 17B in conjunction with the line 840 extending to line 816. However, where the hold on target interval has expired, then as represented at line 842 and block 844 an audible cue is generated and, as represented at line 846 and block 848 a Table 1 mandated rest interval is commenced. The program then continues as represented at line 850 and block 852 wherein the system cues the user that (A×B)−1 efforts remain out of the previously selected (A×B) efforts and further advises of the time remaining for the rest interval and the current score value. With this display, the system queries as to whether the rest interval has expired as represented at line 854 and block 856. Where the rest time remains at hand, then the system dwells as represented at loop line 858 extending the line 850. However, where the rest interval has expired, then as represented at line 860 and block 862 an audible cue is generated.

Following the generation of this audible cue, as represented at line 870 and block 872 the program reiterates the trial sequence following the mandates of Tables 1 and 2 and the elected parameters. As represented at line 874 and block 876, a query then is made as to whether the repetitions and associated efforts are complete. This value is the product of the elected number of steps A multiplied by the elected number of repetitions, B. Where that number of reiterations has not occurred, then the program continues as represented by look line 878 extending to line 870. Where the number of repetitions is completed, then as represented at line 880 and block 882 a final score is computed and submitted to memory with calendar and force data. Next, as represented at line 884 and block 886 the program selects a message to the user which will be based upon the final score. For example, the user may be advised to consult a therapist or the program directions in the event of the low score and is congratulated in the event of a good score. As represented at line 888 and block 890 those messages are selected. Where the user actuates select switch 24, the program continues as represented at line 892 and node H.

Turning again to FIG. 14A, node H reappears in conjunction with line 796 leading to the block 712 displaying a prompt that, to cause the program to enter the stepped therapy mode, the select switch 24 should be actuated. However, where menu switch 22 is actuated, then as represented at line 896 and block 898 the program displays a prompt that to enter the previous menu, the select switch 24 should be actuated. Where that select switch is so actuated, then as represented at line 900, the program reverts to node E which reappears in the instant figure in conjunction with line 520 extending to block 522. On the other hand, where the user actuates menu switch 22, then as represented at line 902 the program reverts to node G. Node G is shown in the instant figure in conjunction with line 708 extending to block 526.

The user has the option of powering down instrument 10 by pressing select switch 24 for an interval of at least 2 seconds. This power off sequence is represented in the flow chart of FIG. 18. The sequence opens with node 910 and line 912 extending to block 914. Block 914 indicates that select switch 24 is being actuated and held in an actuated state. During this actuated state, as represented at line 916 and block 918 a determination is made as to whether the 2 second interval has elapsed. If it has not, then as represented at line 920 and block 922 a query is posed as to whether the select switch 24 has been released before the termination of 2 seconds. If it has not, the system dwells as represented at loop line 924 extending to line 916. Where the query at block 918 results in an affirmative determination, then as represented at line 926 and block 928 the instrument 10 is powered down. Where the determination at block 922 indicates that the switch 24 has been released prior to the elapsing of 2 seconds, then as represented at line 930 and block 932 the program reverts to the previous or last display which was published at readout 18.

The protocol based isometric exercise approach of the invention has applicability to a broad range of muscle groups of the user. By employing the protocol which, inter alia, involves the evaluation of maximum muscle group strength as a precondition to then applying a factor related protocol, one of those factors may apply to the measured maximum strength value. The remaining factors which involve, for example, variations of target loads, hold times, rest intervals and exercise regimen planning in terms of calendar days achieves a safe and effective utilization of isometric activities. The exercisable anatomical features to be strengthened are generally identifiable as muscle groups of the human anatomy which may include but are not limited: jaw muscles, neck muscles, shoulder muscles, upper arm muscles, lower arm muscles, hand muscles, finger muscles, diaphragm muscles, abdominal muscles, lower back muscles, upper leg muscles, lower leg muscles, ankle muscles, foot muscles, and toe muscles.

Looking to FIG. 19, a flow diagram is presented which outlines the methodology achieving this safe utilization of isometric exercises. In the figure, block 950 reveals that the user or therapist may establish a goal of strength for the muscle group involved. This may be achieved by measuring the maximum strength of an unimpaired contralateral muscle group. For example, a left arm or upper leg muscle group may be tested to determine a strength goal for a right arm or right upper leg muscle. Where no unimpaired contralateral muscle group is available to set this goal strength, a medical professional will establish an appropriate goal strength. The method continues as represented at line 952 of block 954 providing for the measurement of maximum strength of the specific anatomical feature to be treated. As represented at line 956 and block 958, the methodology identifies a protocol matrix of factors. In this regard, a strengthening protocol is derived which is based upon timed efforts which are equal to a percentage of the measured maximum strength as derived in connection with block 954. The matrix of factors further include hold times at a factor or factors of the measured maximum strength, the repetition of these efforts for a given trial or exercise session and the duration of rest periods where repetitions are involved. Such protocol further will indicate the intervals of repetitions of the exercise sessions themselves during a stated period of time in hours, days, weeks, months and the like. This matrix of factors may be contained, for example, in computer memory. Looking to line 960 and block 962, the procedure next nominates values to the factors provided in conjunction with block 958. In this regard, the strengthening protocol which is developed utilizes nominated factors from the matrix of these exercise factors. In effect, the nominated factors may be identified as “effort” applied by the specific anatomical feature and the effort time period during which the effort is to be applied such that there is a relationship among the percentage of the measured maximum strength of time wherein the higher the percentage, the shorter the effort time and the number of repetitions of these efforts during an exercise session, the rest period time between cessation of one effort and the beginning of the next succeeding effort such that there is a relationship between the percentage of the measured maximum strength and the rest time wherein the higher the percentage the longer the rest time and the number of exercise sessions in a given time period (hours, days, weeks, months). As represented at line 964 and block 966, the procedure initiates and monitors the exercise protocol with nominated factors. In this regard, the procedure monitors and guides the exercise effort to be applied and while being applied, provides visual and/or audible cues to encourage compliance to the elected protocol using symbols as the visual cues and words which clearly guide the effort to be applied. While that effort is being applied, using audible cues and words which assist to properly perform the effort, rest periods and repetitions for each exercise session. Looking to line 968 of block 970, the method provides for annunciating an alarm when an exercise effort level is exceeded. In this regard, an audible alarm is produced if the exercise effort exceeds a predetermined or factor determined level beyond which it is considered that the exercise effort could be damaging to the human physiology or the specific anatomical feature at hand. As represented at line 972 and block 974 the method provides compliance scores in real-time and in summation during the course of an exercise effort and subsequent thereto. As described herein, the program calculates a compliance score during each exercise effort in percent of that effort required in the strengthening protocol and provides this compliance score in real-time as the effort is being accomplished on the specific anatomical feature. An averaging of this compliance score over each exercise effort time period is devised to depict the degree to which the exercise effort applied has been accomplished. By accumulating the compliance scores during each rest period and then presenting a final compliance score issued in the form of both a number as a percent accomplished and in an instruction set an indication is derived as to how well the exercise protocol was performed or how to improve future compliance. Next, as represented at line 976 at block 978 the exercise data is archived for review and potential transfer to a remote interactive entity. This step in the procedure accumulates real-time and summary data for each effort or trial and the specific protocol being utilized. It may be noted that these protocols are selected each time the exercisable anatomical feature is elected to be strengthened such that the elected protocol, the effort being applied and the compliance being calculated during and at the conclusion of each effort may be reviewed remotely as it is being accomplished using suitable data communication assistance and at the conclusion of each effort. The archive data is time-stamped and uniquely identified for retrieval.

Through use of the invention, cardiac function and a variety of physiologic effects are produced, including effects on the endothelium and the release of biological active signaling molecules, including nitric oxide.

The following studies demonstrate the measureable biochemical and biophysical effect of utilization of the system, method, and apparatus of the invention.

Use of Isometric Exercise to Treat Hypertension

Among many other factors, both hypertension and arterial distensibility are independent risk factors for cardiovascular disease. The research of Wiley et al. (1992) and Taylor et al. (2003) demonstrated that isometric training is effective for reducing resting blood pressure (RBP). NO is a potent vasodilator, and crucial component of the regulation of vascular tension (See FIG. 20), thus, isometric exercise is expected to affect NO production and bioavailability.

As NO is a rapidly diffusible gas, release of NO in the blood vessels of the arms or other muscle groups, in response to isometric training, is expected to have both a local and systemic effect on vasodilation, arterial distensibility and resting blood pressure. Thus an increase of arterial distensibility in response to isometric exercise may contribute to reduction in RBP and increased NO bioavailability. A wide variety of muscle groups such as from exercisable regions of the musculature of the user including jaw muscles, neck muscles, shoulder muscles, upper arm muscles, lower arm muscles, hand muscles, finger muscles, diaphragm muscles, abdominal muscles, lower back muscles, upper leg muscles, lower leg muscles, ankle muscles, foot muscles, and toe muscles may provide a therapeutic benefit by utilization of the isometric exercise protocols of the invention.

To demonstrate the systemic effect of practicing the system and method of the invention, the impact of isometric arm and leg exercise on RBP and central and peripheral arterial distensibility was tested in patients being medicated for hypertension. Resting blood pressure was measured by brachial oscillometry, and arterial distensibility, as measured by Doppler ultrasound and applanation tonometry in the carotid, brachial and femoral arteries. Study participants were directed to perform isometric handgrip (IHG) exercise (n=10), or isometric leg press (ILP) exercise (n=6) according to the method of the invention three times per week for eight weeks. Exercise intensity was maintained at 30% of maximal voluntary contraction.

Following eight weeks of IHG exercise, systolic blood pressure decreased significantly (from 140.2 mmHg+/−3.82 to 132.3 mmHg+/−3.97), while no decrease was observed after isometric leg press exercise. Diastolic blood pressure did not change after either IHG or ILP exercise. Measurement of carotid arterial distensibility showed a significant improvement following IHG exercise (from 0.1105 mmHg−/−1.times.10.sup.-2 0.0093 to 0.1669 mmHg+/−1.times.10.sup.-2 0.0221), while no such changes occurred in the ILP exercise group. Peripheral arterial distensibility did not change following either IHG or ILP exercise. These studies demonstrate that the isometric handgrip exercise according to the invention improves resting systolic blood pressure and carotid arterial distensibility. As arterial tension is under the direct control of the NO/LDL-cholesterol signaling system, the system and method of the invention allows modulation of NO and indirectly of the LDL-cholesterol components.

As described previously, hypertension is associated with endothelial dysfunction, reduced NO bioavailability, and the development of coronary artery disease among other effects on the body of the patient. The isometric hand grip exercise protocol of the invention further reduces blood pressure even in patients already medicated for hypertension. In order to demonstrate the mechanisms of IHG affect on hypertension, endothelial function was studied in patients practicing the system and method of the invention. Study participants (n=8, 62+/−3.5 years) performed 4 sets of 2-minute isometric contractions at 30% of their maximal voluntary contraction. Ulnar reactivity was assessed in alternate hands, 3×/week for 8 weeks. Resting blood pressure was measured using automated brachial oscillometry. Vascular reactivity was measured in both arms using ultrasound imaging to determine brachial artery flow-mediated dilation (FMD). Following utilization of the IHG protocol of the invention, systolic blood pressure decreased (137 mm Hg+/−5.3 to 121.7 mm Hg=/−4.8 mmHg, p=0.03). Relative FMD increased (1.6%+/−0.3 to 4.5%+/−0.5 and normalized to average shear rate, 0.007%+/−0.001 to 0.02+/−0.004%/s−1). Reactive hyperemic flow decreased (peak, 344.3+/−36.5 to 258.2+/−27.2 ml/min and average, 301.6+/−33.1 to 239.0+/−28.4 ml/min). Average resting blood vessel diameter and resting flow rates remained unchanged.

As systemic shear stress is known to induce the activity of NO as a vasodilator, the IHG training apparently causes the release of NO, as shown by an increase in flow mediated arterial dilation. The IHG exercise protocol produced a reduced reactive hyperemic flow, accompanied by improvements in normalized FMD, and a heightened vasoreactive sensitivity to the reactive hyperemic stimulus. The IHG protocol by providing an improved cardiovascular function, demonstrates a modification of the wall shear stress setpoint for the activation of eNOS to produce biologically active levels of NO.

The statin class of drugs used in the treatment of hypercholesterolemia surprisingly has a pleiotropic effect on a variety of other systems of the body, including on the bioavailability of NO. Thus, by down-modulating cholesterol biosynthesis, statin drugs affect systems that are controlled by NO dependent signaling systems. The method and apparatus of the invention, surprisingly, by stimulating changes in the structure of the vasculature, and by creating increased wall shear stress in the blood vessels experiencing the effects of the inventive protocol, also induces broad effects on signaling systems including those that regulate the bioavailability of NO and serum cholesterol and LDL-cholesterol levels.

The above-described studies demonstrate use of the system and apparatus described herein to dilate blood vessels (e.g., arteries, arterioles) by causing the increased secretion of NO by inducing shear stress on blood vessel walls, resulting in positive effects on reducing hypertension. Thus, the system and apparatus described herein is also beneficial in treating other afflictions which may have their cause rooted in problems with the circulatory system (or which may be treated via improvement to the circulatory system of an affected individual). As described below, such afflictions may include ED, type 2 diabetes, and obesity.

Use of Isometric Exercise to Treat Erectile Dysfunction in Males

As described above, the system and method of the present invention may be used to dilate blood vessels by causing the increased secretion of NO by inducing shear stress on blood vessel walls. As ED is known to often have a circulatory component to its cause, and as the NO pathway plays an important role in the process of penile erection, the system and apparatus described herein is also beneficial in treating ED.

Mechanism of Penile Erection

As is known, penile erection may be achieved via two different mechanisms. The first is the reflex erection, which is achieved by a direct touching of the penile shaft. The second is the psychogenic erection, which is achieved by erotic or emotional stimuli. In general, stimulation of the penile shaft by the nervous system leads to the secretion of nitric oxide (NO), which causes the relaxation of smooth muscles of corpora cavernosa (the main erectile tissue of penis). If viewed in cross section, the penis consists of three tube-like projections of spongy tissue, the corpus spongiosum, located ventrally and the paired corpi cavernosi located dorsally. In each of the latter is the deep artery of the penis which carries blood over the length of the penis into the open channels that make up the corpus cavernosum. The blood carried out of the corpi cavernosi empties into the dorsal vein of the penis which then returns the blood to the body. The level of rigidity of the penis is due to the relationship between arterial inflow and venous outflow in the penis. This means that the larger the diameter of the arteries, the more blood enters the corpus cavernosum and enlarges the penis.

In the process of penile erection, NO is released with sexual stimulation from nerve endings and endothelial cells in the corpus cavernosum of the penis. NO activates soluble guanylate cyclase, enhancing production of guanosine 3′,5′-cyclic monophosphate (cGMP), by converting guanosine triphosphate (GTP) into cGMP. cGMP causes the smooth muscle to relax, which causes an inflow of blood, which then leads to an erection. cGMP is then hydrolyzed back to the inactive GMP by phosphodiesterase type 5 (PDE5).

Impotence may develop due to lack of adequate penile blood supply. For example, restriction of blood flow can arise from impaired endothelial function. This may be due to causes associated with coronary artery disease. Other conditions, such as diabetes and/or obesity may contribute to ED.

Medications to Treat ED

As is known to those of ordinary skill in the art, various medications may be taken to treat ED. The most common of these medications are phosphodiesterase type 5 inhibitors (PDE-5 inhibitors). The PDE-5 inhibitors sildenafil (Viagra), vardenafil (Levitra) and tadalafil (Clalis) are prescription drugs which are taken orally. They work by blocking the action of PDE5, which causes cGMP to degrade (cGMP being necessary to a successful erection, as described above, by causing smooth muscle to relax, thereby causing inflow of blood to the penis; if cGMP is degraded, there is less smooth muscle relaxation, less inflow of blood, and no or weak erection).

The levels of cGMP are therefore controlled by the activation of cyclic nucleotide cyclase and the breakdown by PDE5. It is the latter that sildenafil acts upon. Men who suffer from erectile dysfunction often produce too little amounts of NO. This means that the small amount of cGMP they produce is broken down at the same rate and therefore doesn't have the time to accumulate and cause a prolonged vasodilation effect. Sildenafil works by inhibiting the enzyme PDE-5 by occupying its active site. This means that cGMP is not hydrolyzed as fast and this allows the smooth muscle to relax.

Use of Isometric Exercise with Individuals Suffering from ED

In view of the discussion above, it is clear that the NO pathway has an important role in achieving and maintaining an erection. It is also clear that, currently, expensive medications are the main treatment prescribed to those suffering from ED. However, with the principles of the method, system, and apparatus of the present invention, one may treat ED, and achieve and maintain erection, without the use of such medications, but rather through the use of isometric exercise.

Thus, like the method of the present invention for lowering the resting systolic and diastolic blood pressures of patients (described above), another aspect of the present invention includes a method for treating ED via isometric exercise (to stimulate increase of NO, and thus arterial dilation). In one embodiment, this method may begin by determining the maximal isometric force which can be exerted by a patient with any given muscle (e.g., skeletal muscle or group of muscles). The determined maximal isometric force is recorded, and the patient is periodically permitted to intermittently engage in isometric contraction of the given muscle at a fractional level of the maximal force determined for a given contraction duration followed by a given resting duration. When using a apparatus, (such as one described above), a perceptible indicia correlative to the isometric force exerted by the given muscle may be displayed to the patient so that the patient can sustain the given fractional level of maximal force.

A representative procedure for a patient to follow includes the patient exerting a force with a selected muscle or muscle group to about 50%.+−0.5% of the previously determined maximal isometric force (of that muscle or muscle group) and holding that 50% force for 45 seconds; resting for one minute; and then repeating multiple times. The particular muscle or muscle group may be selected based upon the treatment desired. For example, the method may include exerting a squeezing force with either hand equal to about 50%.+−0.5% of the previously determined maximal isometric force and holding that 50% force for 45 seconds; resting for one minute; exerting a force with the other hand equal to 50% of the maximum for 45 seconds; resting one minute; exerting a force of 50% of maximum for 45 seconds again with the first hand; resting one minute; and exerting a force of 50% for 45 seconds again with the second hand. This completes the isometric exercise for that day. The same procedure may be followed by the patient multiple days (e.g., at least five days per week). It will be recognized by those of ordinary skill in the art that the use of “hand” for the muscle group is exemplary. It will also be recognized by those of ordinary skill in the art that the protocol may be adapted based on the patient, the muscle group, the affliction, or other factors.

Thus, the isometric component of exercise alone can be used to stimulate NO production to increase arterial diameter and treat ED (via subsequent increased blood flow into the penis), by following a simple, yet effective, regimen that includes exerting fractional isometric force by any given muscle (for present purposes, “muscle” includes any skeletal muscle or group of muscles) for a given duration followed by a given duration of resting. This sequence is repeated several times (say, from about 3 to 6 times) and the entire regimen is repeated several times per week (say, from about 3 to 7 times per week). Since the regimen takes only several minutes per day to complete, it is believed that patients will be better able to stay with the program and, thus, receive long term benefits in treating ED. Moreover, since the patient exerts only a fraction of the maximal force of the given muscle, the patient's blood pressure during the exercise protocol does not rise to unacceptably high values whereat the patient's health would be at risk.

Another aspect of the therapeutic method associated with the instrument of the invention resides in the limiting of user performance to carry out the regimen of trials. In this regard, the instrument is programmed to perform only within predetermined and mandated test limits. Each therapeutic regimen is based upon an initial evaluation of the maximum gripping force capability of the user. Under that limitation, target load factors, hold on target load intervals, intervening rest intervals and trial repetition numbers may be elected only from pre-established and mandated memory retained ranges. The program also nominates rest intervals and hold on target intervals in correspondence with user elected target force factors. Thus, valuable strength recovery and development may be achieved but only within safe limits.

Additionally, the instrument is employable as a therapeutic device. First a protocol is nominated by prescribing nominal parameters of the effort. Each isometric regimen is controlled initially by requiring that a maximum grip strength be established for each individual patient or user. Then, the practitioner may elect parameters of grip force and timing under mandated memory contained parameter limits. Accordingly, the user will be unable to carry out strength enhancement therapies which would otherwise constitute an excessive grip force regimen. For carrying out the noted diagnostic procedures as well as therapy activities, the grip widthwise extent is variable from 1⅞ inches to 2⅞ inches, such variation being adjustable in ½ inch increments. This is in keeping with standardized diagnostic practices. Further with respect to diagnostic procedures, the display or readout of the instrument can be adjusted with respect to the grip structuring such that only the practitioner or therapist may observe the data which is being developed during a diagnostic protocol.

More particular description of examples of protocols are shown in FIG. 19, (described in greater detail above), which presents a flow diagram that outlines the methodology achieving this safe utilization of isometric exercises.

Use of Isometric Exercise to Enhance Sexual Stimulation in Females

Apart from the use of isometric exercise to treat sexual dysfunction (e.g., erectile dysfunction) in males, another aspect of the present invention also contemplates use of isometric exercise to enhance sexual function in females, particularly by enhancing clitoral sensitivity.

To that end, as described above, it is known that sildenafil (and other medications; PDE5 inhibitors) are effective treatments for male ED. Recent studies, however, have also shown that sildenafil can improve uterine circulation and clitoral artery blood flow, and that this occurs due to the same NO pathway as in penile erection.

For example, Alatas E, Yagci A B., The effect of sildenafil citrate on uterine and clitoral arterial blood flow in postmenopausal women, MedGenMed. 2004 Oct. 13; 6(4):51, incorporated by reference herein in its entirety, determined the effect of sildenafil on uterine circulation and clitoral artery blood flow in postmenopausal women using color Doppler sonography. After sildenafil administration, the mean resistance and pulsatility indexes of uterine artery were significantly lower (0.73±0.08 vs 0.80±0.07, P<0.001 and 1.66±0.50 vs 2.08±0.52, P<0.001, respectively) in comparison to baseline values, and the mean peak systolic velocity of clitoral artery was significantly higher (17.9±8.6 cm/sec vs 12.9±5.8 cm/sec, P<0.001). Sildenafil did not cause any significant change in the mean resistance and pulsatility indexes of the clitoral artery (P=0.683 and P=0.714, respectively). Thus, it was determined that sildenafil improves the clitoral and uterine blood flow in healthy postmenopausal women without any erotic stimulus. As a result, the NO pathway may be a candidate target for drug therapy for female sexual dysfunction.

Further studies have revealed that the neurovascular mechanism of this clitoral stimulation is NO-dependent. In one such study [Ferrante, S. G., et al., The neurovascular mechanism of clitoral erection: nitric oxide and cGMP-stimulated activation of BKCa channels, The FASEB Journal. 2004; 18:1382-1391, incorporated by reference herein in its entirety], the investigators hypothesized that rat clitorises relax by a similar mechanism as seen in penile erection (i.e., via the NO pathway). Rat clitorises express components of the proposed pathway: neuronal and endothelial NO synthases, soluble guanylyl cyclase (sGC), type 5 phosphodiesterase (PDE-5), and BKCa channels. The NO donor diethylamine NONOate (DEANO), the PKG activator 8-pCPT-cGMP, and the PDE-5 inhibitor sildenafil, cause dose-dependent clitoral relaxation that is inhibited by antagonists of PKG (Rp-8-Br-cGMPS) or BKCa channels (iberiotoxin). Electrical field stimulation induces tetrodotoxin-sensitive NO release and relaxation that is inhibited by the Na+ channel blocker tetrodotoxin or sGC inhibitor 1H-(1,2,4)oxadiozolo(4,3-a)quinoxalin-1-one. Human BKCa channels, transferred to Chinese hamster ovary cells via an adenoviral vector, and endogenous rat clitoral smooth muscle K+ current are activated by this PKG-dependent mechanism. Laser confocal microscopy reveals protein expression of BKCa channels on clitoral smooth muscle cells; these cells exhibit BKCa channel activity that is activated by both DEANO and sildenafil. Thus, the investigators concluded that neurovascular derived NO causes clitoral relaxation via a PKG-dependent activation of BKCa channels.

Further, as described previously, various PDE-5 inhibitors have been developed for human use (including sildenafil, vardenafil, and tadalafil) and they inhibit PDE-5 in cultured clitoral corpus cavernosal smooth muscle cells, relax the corpus cavernosum of the rabbit clitoris, and increase blood flow to the genitalia of the female dog. Thus, the present inventors conclude that use of such treatments for female mammals would be indicated across species, and thus would include humans (i.e., medications such as sildenafil would be useful for female sexual dysfunction in humans).

Berman J R, et al., Effect of sildenafil on subjective and physiologic parameters of the female sexual response in women with sexual arousal disorder, J Sex Marital Ther. 2001 October-December; 27(5):411-20, incorporated by reference herein in its entirety, supports this conclusion. Berman notes that sexual dysfunction is a complaint of 30-50% of American women and, aside from hormone replacement therapy, there currently are no FDA-approved medical treatments for female sexual complaints. The goal of the Berman study was to determine safety and efficacy of sildenafil for use in women with sexual arousal disorder (SAD). Following administration of sildenafil, poststimulation physiologic measurements improved significantly compared to baseline. Baseline subjective sexual function complaints, including low arousal, low desire, low sexual satisfaction, difficulty achieving orgasm, decreased vaginal lubrication, and dyspareunia [painful intercourse] also improved significantly following 6 weeks home use of sildenafil. Thus, Berman concluded that sildenafil significantly improves both subjective and physiologic parameters of the female sexual response. A follow-up study by Berman, [Berman J R, et al., Safety and efficacy of sildenafil citrate for the treatment of female sexual arousal disorder: a double-blind, placebo controlled study, J Urol. 2003 December; 170(6 Pt 1):2333-8, incorporated by reference herein in its entirety], also supported these conclusions.

For males, sildenafil may overcome the lack of penile erection, which disallowed intercourse. In females, this suggests that sildenafil may allow or enhance engorgement of the clitoris, which may enhance the pleasure of intercourse.

However, as with the drawbacks to drug therapies for male ED, similar issues exist with treatments for female sexual dysfunction, and so an aspect of the present invention provides a method, system, and apparatus for isometric exercise to improve clitoral artery blood flow for treatment of female sexual dysfunction, thereby obviating the need for drug-based treatment (such as with sildenafil or other drug compositions). Due to the studies showing potential use of sildenafil in females, the present invention also contemplates use of isometric exercise to allow or enhance engorgement of the clitoris, which may enhance the pleasure of intercourse. And so an aspect of the present invention provides a method, system, and apparatus for isometric exercise to improve clitoral artery blood flow for treatment of female sexual dysfunction.

Thus, like the method of the present invention for lowering the resting systolic and diastolic blood pressures of patients (described above), another aspect of the present invention includes a method for treating female sexual dysfunction via isometric exercise (to stimulate increase of NO, and thus arterial dilation). This method may begin with a determination of the maximal isometric force which can be exerted by a patient with any given muscle (e.g., skeletal muscle or group of muscles) of such patient. The determined maximal isometric force is recorded. The patient, then, is periodically permitted to intermittently engage in isometric contraction of the given muscle at a fractional level of the maximal force determined for a given contraction duration followed by a given resting duration. A perceptible indicia correlative to the isometric force exerted by the given muscle is displayed to the patient so that the patient can sustain the given fractional level of maximal force.

A representative procedure for a patient to follow includes the patient exerting a force with a selected muscle or muscle group to about 50%.+−0.5% of the previously determined maximal isometric force (of that muscle or muscle group) and holding that 50% force for 45 seconds; resting for one minute; and then repeating multiple times. The particular muscle or muscle group may be selected based upon the treatment desired. For example, the method may include exerting a squeezing force with either hand equal to about 50%.+−0.5% of the previously determined maximal isometric force and holding that 50% force for 45 seconds; resting for one minute; exerting a force with the other hand equal to 50% of the maximum for 45 seconds; resting one minute; exerting a force of 50% of maximum for 45 seconds again with the first hand; resting one minute; and exerting a force of 50% for 45 seconds again with the second hand. This completes the isometric exercise for that day. The same procedure may be followed by the patient multiple days (e.g., at least five days per week). It will be recognized by those of ordinary skill in the art that the use of “hand” for the muscle group is exemplary.

Thus, the isometric component of exercise alone can be used to stimulate NO production to increase arterial diameter and treat female sexual dysfunction, by following a simple, yet effective, regimen that includes exerting fractional isometric force by any given muscle (for present purposes, “muscle” includes any skeletal muscle or group of muscles) for a given duration followed by a given duration of resting. This sequence is repeated several times (say, from about 3 to 6 times) and the entire regimen is repeated several times per week (say, from about 3 to 7 times per week). Since the regimen takes only several minutes per day to complete, it is believed that patients will be better able to stay with the program and, thus, receive long term benefits in treating female sexual dysfunction. Moreover, since the patient exerts only a fraction of the maximal force of the given muscle, the patient's blood pressure during the exercise protocol does not rise to unacceptably high values whereat the patient's health would be at risk.

An important aspect of the therapeutic method associated with the instrument of the invention resides in the limiting of user performance to carry out the regimen of trials. In this regard, the instrument is programmed to perform only within predetermined and mandated test limits. Each therapeutic regimen is based upon an initial evaluation of the maximum gripping force capability of the user. Under that limitation, target load factors, hold on target load intervals, intervening rest intervals and trial repetition numbers may be elected only from pre-established and mandated memory retained ranges. The program also nominates rest intervals and hold on target intervals in correspondence with user elected target force factors. Thus, valuable strength recovery and development may be achieved but only within safe limits.

Additionally, the instrument is employable as a therapeutic device. First a protocol is nominated by prescribing nominal parameters of the effort. Each isometric regimen is controlled initially by requiring that a maximum grip strength be established for each individual patient or user. Then, the practitioner may elect parameters of grip force and timing under mandated memory contained parameter limits. Accordingly, the user will be unable to carry out strength enhancement therapies which would otherwise constitute an excessive grip force regimen. For carrying out the noted diagnostic procedures as well as therapy activities, the grip widthwise extent is variable from 1⅞ inches to 2⅞ inches, such variation being adjustable in ½ inch increments. This is in keeping with standardized diagnostic practices. Further with respect to diagnostic procedures, the display or readout of the instrument can be adjusted with respect to the grip structuring such that only the practitioner or therapist may observe the data which is being developed during a diagnostic protocol.

More particular description of examples of protocols are shown in FIG. 19, (described in greater detail above), which presents a flow diagram that outlines the methodology achieving this safe utilization of isometric exercises.

Use of Isometric Exercise to Treat Obesity

As described above, obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy and/or increased health problems. Obesity increases the likelihood of various diseases, such as heart disease and type 2 diabetes. And obesity is most commonly caused by a combination of excessive food energy intake, lack of physical activity, and genetic susceptibility.

Persons who are obese have increased, and often tremendous, amounts of fat stored in their bodies. The primary cells that make up these fat stores are white adipocytes (which make up the white adipose tissue). Apart from white adipose tissue, brown adipose tissue (BAT), or brown fat, is another type of fat. BAT is especially abundant in newborns and in hibernating mammals. Its primary function is to generate body heat in animals or newborns that do not shiver. In contrast to white adipocytes (fat cells), which contain a single lipid droplet, brown adipocytes contain numerous smaller droplets and a much higher number of mitochondria (these are involved in the metabolism of fat molecules, which release energy and heat, and get rid of the fat). Brown fat also contains more capillaries than white fat, since it has a greater need for oxygen than most tissues.

Recent studies using Positron Emission Tomography scanning of adult humans have shown that brown fat is present in adults in the upper chest and neck, though not to the extent it is present as a percentage of fat in newborns. These remaining deposits become more metabolically active with cold exposure, and less metabolically active if an adrenergic beta blocker is given before the scan. This could suggest a new method of weight loss, since brown fat takes calories from normal fat and burns it.

And indeed, more recently, it has been determined that by activating brown fat, one can burn white fat. For example, Cederberg A, et al., FOXC2 is a winged helix gene that counteracts obesity, hypertriglyceridemia, and diet-induced insulin resistance, Cell. 2001 Sep. 7; 106(5):563-73 (incorporated by reference herein in its entirety), identified the human winged helix/forkhead transcription factor gene FOXC2 as a key regulator of adipocyte metabolism. Increased FOXC2 expression, in adipocytes, has a pleiotropic effect on gene expression, which leads to a lean and insulin sensitive phenotype. FOXC2 affects adipocyte metabolism by increasing the sensitivity of the beta-adrenergic-cAMP-protein kinase A (PKA) signaling pathway through alteration of adipocyte PKA holoenzyme composition.

Further, Boström, P., et al., A PGC1-α-dependent myokine that drives brown-fat-like development of white fat and thermogenesis, Nature, Volume 481, pp. 463-468, Jan. 26, 2012, incorporated by reference herein in its entirety, demonstrated mechanisms by which exercise can improve metabolic status in obesity and type 2 diabetes.

As noted by Boström et al., exercise increases whole body energy expenditure beyond the calories used in the actual work performed. Because transgenic mice expressing PGC1-α selectively in muscle showed a remarkable resistance to age-related obesity and diabetes, Boström et al. sought factors secreted from muscle under the control of this co-activator that might increase whole body energy expenditure, and ultimately described a new polypeptide hormone, irisin (a cleaved and secreted portion of FNDC5), which is regulated by PGC1-α, secreted from muscle into blood, and activates thermogenic function in adipose tissues. Irisin has powerful effects on the browning of certain white adipose tissues, both in culture and in vivo. Nanomolar levels of this protein increase UCP1 in cultures of primary white fat cells by 50 fold or more, resulting in increased respiration. Further, viral delivery of irisin that causes only a moderate increase (˜3 fold) in circulating levels stimulates a 10-20 fold increase in UCP1, increased energy expenditure and an improvement in the glucose tolerance of mice fed a high fat diet. As this is in the range of increases seen with exercise in mouse and man, it is likely that irisin is responsible for at least some of the beneficial effects of exercise on the browning of adipose tissues and increases in energy expenditure.

Further, irisin is highly conserved in all mammalian species that have been sequenced. Mouse and human irisin are 100% identical, compared to 85% identity for insulin, 90% identity for glucagon, and 83% identity for leptin. This implies a highly conserved function that is likely to be mediated by a cell surface receptor.

On the basis of the gene structure of FNDC5, Boström et al. considered that FNDC5 might be a secreted protein. They observed that the signal peptide is removed, and the mature protein is further proteolytically cleaved and glycosylated, to release the 112-amino-acid polypeptide irisin. The cleavage and secretion of irisin is similar to the release/shedding of other transmembrane polypeptide hormones and hormone-like molecules such as epidermal growth factor (EGF) and transforming growth factor-α (TGF-α).

Thus, irisin would seem to have therapeutic potential. Exogenously administered irisin induces the browning of subcutaneous fat and thermogenesis, and it presumably could be prepared and delivered as an injectable polypeptide. Increased formation of brown or beige/brite fat has been shown to have anti-obesity, antidiabetic effects in multiple murine models, and adult humans have significant deposits of UCP1-positive brown fat. Data presented by Boström et al. show that even relatively short treatments of obese mice with irisin improves glucose homeostasis and causes a small weight loss. Whether longer treatments with irisin and/or higher doses would cause more weight loss remains to be determined. The worldwide, explosive increase in obesity and diabetes renders attractive the therapeutic potential of irisin in these and related disorders.

However, a treatment for obesity that includes injections of irisin presents drawbacks (e.g., medical supervision for injection—which involves time and travel; cost; etc.). Thus, like the method of the present invention for lowering the resting systolic and diastolic blood pressures of patients (described above), another aspect of the present invention includes a method for treating obesity via isometric exercise (to stimulate production and secretion of irisin). This method may begin with a determination of the maximal isometric force which can be exerted by a patient with any given muscle (e.g., skeletal muscle or group of muscles) of such patient. The determined maximal isometric force is recorded. The patient, then, is periodically permitted to intermittently engage in isometric contraction of the given muscle at a fractional level of the maximal force determined for a given contraction duration followed by a given resting duration. A perceptible indicia correlative to the isometric force exerted by the given muscle is displayed to the patient so that the patient can sustain the given fractional level of maximal force.

A representative procedure for a patient to follow includes the patient exerting a force with a selected muscle or muscle group to about 50%.+−0.5% of the previously determined maximal isometric force (of that muscle or muscle group) and holding that 50% force for 45 seconds; resting for one minute; and then repeating multiple times. The particular muscle or muscle group may be selected based upon the treatment desired. For example, the method may include exerting a squeezing force with either hand equal to about 50%.+−0.5% of the previously determined maximal isometric force and holding that 50% force for 45 seconds; resting for one minute; exerting a force with the other hand equal to 50% of the maximum for 45 seconds; resting one minute; exerting a force of 50% of maximum for 45 seconds again with the first hand; resting one minute; and exerting a force of 50% for 45 seconds again with the second hand. This completes the isometric exercise for that day. The same procedure may be followed by the patient multiple days (e.g., at least five days per week). It will be recognized by those of ordinary skill in the art that the use of “hand” for the muscle group is exemplary.

Thus, the isometric component of exercise alone can be used to stimulate production and secretion of irisin, to promote the browning of white fat, and treat obesity by following a simple, yet effective, regimen that includes exerting fractional isometric force by any given muscle (for present purposes, “muscle” includes any skeletal muscle or group of muscles) for a given duration followed by a given duration of resting. This sequence is repeated several times (say, from about 3 to 6 times) and the entire regimen is repeated several times per week (say, from about 3 to 7 times per week). Since the regimen takes only several minutes per day to complete, it is believed that patients will be better able to stay with the program and, thus, receive long term benefits in treating obesity. Moreover, since the patient exerts only a fraction of the maximal force of the given muscle, the patient's blood pressure during the exercise protocol does not rise to unacceptably high values whereat the patient's health would be at risk.

An important aspect of the therapeutic method associated with the instrument of the invention resides in the limiting of user performance to carry out the regimen of trials. In this regard, the instrument is programmed to perform only within predetermined and mandated test limits. Each therapeutic regimen is based upon an initial evaluation of the maximum gripping force capability of the user. Under that limitation, target load factors, hold on target load intervals, intervening rest intervals and trial repetition numbers may be elected only from pre-established and mandated memory retained ranges. The program also nominates rest intervals and hold on target intervals in correspondence with user elected target force factors. Thus, valuable strength recovery and development may be achieved but only within safe limits.

Additionally, the instrument is employable as a therapeutic device. First a protocol is nominated by prescribing nominal parameters of the effort. Each isometric regimen is controlled initially by requiring that a maximum grip strength be established for each individual patient or user. Then, the practitioner may elect parameters of grip force and timing under mandated memory contained parameter limits. Accordingly, the user will be unable to carry out strength enhancement therapies which would otherwise constitute an excessive grip force regimen. For carrying out the noted diagnostic procedures as well as therapy activities, the grip widthwise extent is variable from 1⅞ inches to 2⅞ inches, such variation being adjustable in ½ inch increments. This is in keeping with standardized diagnostic practices. Further with respect to diagnostic procedures, the display or readout of the instrument can be adjusted with respect to the grip structuring such that only the practitioner or therapist may observe the data which is being developed during a diagnostic protocol.

More particular description of examples of protocols are shown in FIG. 19, (described in greater detail above), which presents a flow diagram that outlines the methodology achieving this safe utilization of isometric exercises.

Use of Isometric Exercise to Treat Diabetes

As described above, type 2 diabetes is a metabolic disorder that is characterized by high blood glucose in the context of insulin resistance and relative insulin deficiency. Obesity is thought to be the primary cause of type 2 diabetes in people who are genetically predisposed to the disease. It is well known that there is an intimate link between type 2 diabetes and obesity. Above is disclosed the use of isometric exercise to combat obesity in individuals. As reduction of obesity is known to improve the diabetic condition by improving insulin sensitivity, another aspect of the present invention therefore contemplates the use of isometric exercise as therapy for type 2 diabetes.

In fact, recent studies have demonstrated an increase in the metabolic breakdown of glucose (and other carbohydrates) following isometric contraction of muscle, thereby reducing blood sugar levels. For example, in Katz A, Lee A D, G-1,6-P2 in human skeletal muscle after isometric contraction, Am J. Physiol. 1988 August; 255(2 Pt 1):C145-8 (incorporated by reference herein in its entirety), the content of glucose 1,6-bisphosphate (G-1,6-P2), an in vitro activator of phosphofructokinase (a rate-limiting enzyme for glycolysis), and the glycolytic rate in skeletal muscle during isometric contraction were determined. In the study, subjects contracted the knee extensor muscles at two-thirds maximal voluntary force to fatigue, and biopsies from the quadriceps femoris muscle were obtained before and immediately after contraction. G-1,6-P2 increased in all subjects from a mean of 101+/−15 (SE) mumol/kg dry wt at rest to 128+/−24 at fatigue (P less than 0.05). Muscle glucose did not change significantly, whereas hexosemonophosphates were significantly increased after contraction. The glycogenolytic and glycolytic rate averaged 70.0+/−13.8 and 47.3+/−6.7 mmol.kg dry wt⁻¹ min-1, respectively, and the glycolytic rate was positively correlated with the accumulation rates of fructose 6-phosphate (F-6-P) (r=0.95, P less than 0.01) and G-6-P (r=0.96, P less than 0.01). Phosphocreatine and ATP decreased by 87 and 17%, respectively, whereas ADP increased by 31% after contraction. These data demonstrate that intense, short-term isometric contraction results in an elevation of the muscle content of G-1,6-P2.

In another study, it was shown that diabetics respond the same as non-diabetics to stressors from isometric contractions (see, Kelleher C, Ferriss J B, Ross H, O'Sullivan D J, The pressor response to exercise and stress in uncomplicated insulin-dependent diabetes, J Hum Hypertens. 1987 June; 1(1):59-64, incorporated by reference herein in its entirety).

In that study, Kelleher et al. investigated whether or not an increased pressor response to exercise (i.e., the rise in blood pressure during isometric contractions) or stress is a feature of the diabetic state per se or a feature of its complications. Twelve insulin-dependent diabetic patients without clinical evidence of complications and with normal albumin excretion rates (less than 20 mg/min) were studied with 12 control subjects. Each underwent a study protocol of isometric handgrip exercise at 30% of maximum capacity for four minutes, a cold pressor test with immersion of one hand in ice-cold water for two minutes, and bicycle ergometry at a resistance of 105 watts per minute for six minutes. Both groups showed a similar and significant rise in systolic blood pressure and pulse rate in response to each stimulus. Diastolic pressure also rose significantly in response to handgrip exercise and to cold pressor stimulation. Mean plasma noradrenaline concentration rose in response to each stimulus but the changes reached conventional significance in both groups only in response to handgrip exercise. Pressor responses to exercise and stress, as tested in the study, were concluded to be normal in insulin-dependent diabetic patients without complications due to their disease. Thus, diabetics respond the same as non-diabetics to the stressors, which suggests a potential benefit for treating diabetecs with isometric exercise, since the rise in BP during the isometric contractions is the physiological signal that leads to the adaptive response of lower BP over time with repeated isometric training.

Further studies have likewise concluded that resistance training (i.e., isometric exercise) improves metabolic features and insulin sensitivity, and reduces abdominal fat in type 2 diabetic patients. For example, Bacchi E, et al., Metabolic Effects of Aerobic Training and Resistance Training in Type 2 Diabetic Subjects: A randomized controlled trial (the RAED2 study), Diabetes Care. 2012 Feb. 16, [Epub ahead of print], (incorporated by reference herein in its entirety), assessed differences between the effects of aerobic and resistance training on HbA(1c) (primary outcome) and several metabolic risk factors in subjects with type 2 diabetes, and to identify predictors of exercise-induced metabolic improvement. As is known, HbA(1c) is a form of hemoglobin that identifies average glucose in blood plasma over time, i.e. months.

In the study, type 2 diabetic patients (n=40) were randomly assigned to aerobic training or resistance training. Before and after 4 months of intervention, metabolic phenotypes (including HbA(1c), glucose clamp-measured insulin sensitivity, and oral glucose tolerance test-assessed β-cell function), body composition by dual-energy X-ray absorptiometry, visceral (VAT) and subcutaneous (SAT) adipose tissue by magnetic resonance imaging, cardiorespiratory fitness, and muscular strength were measured. After training, increase in peak oxygen consumption (VO(2peak)) was greater in the aerobic group (time-by-group interaction P=0.045), whereas increase in strength was greater in the resistance group (time-by-group interaction P<0.0001). HbA(1c) was similarly reduced in both groups (−0.40% [95% Cl −0.61 to −0.18] vs. −0.35% [−0.59 to −0.10], respectively). Total and truncal fat, VAT, and SAT were also similarly reduced in both groups, whereas insulin sensitivity and lean limb mass were similarly increased. β-Cell function showed no significant changes. In multivariate analyses, improvement in HbA(1c) after training was independently predicted by baseline HbA(1c) and by changes in VO(2peak) and truncal fat. Thus, resistance training, similarly to aerobic training, improves metabolic features and insulin sensitivity and reduces abdominal fat in type 2 diabetic patients. Other studies have shown similar results (e.g., see Lambernd S., et al., Contractile activity of human skeletal muscle cells prevents insulin resistance by inhibiting pro-inflammatory signalling pathways, Diabetologia. 2012 Jan. 27, [Epub ahead of print], incorporated by reference herein in its entirety).

As described above, there are several metabolic links between diabetes and obesity. Put simply, if insulin resistance is high, glucose sugar is not metabolized and glucose and other sugars are readily converted to fats and stored. The studies cited herein use various methods of enhancing or blocking some of these interconnected metabolic pathways to illustrate the effects of exercise on skeletal muscle. Several of the recent studies included isometric contractions, voluntary or electrically induced, which makes it easier to connect or extrapolate from “rhythmic” contraction studies.

Other studies have elucidated the role and effect of certain factors on insulin sensitivity and signaling, even in aged animals. For example, Wenz T., et al., Increased muscle PGC-1 alpha expression protects from sarcopenia and metabolic disease during aging, Proc Natl Acad Sci USA. 2009 Dec. 1; 106(48):20405-10. Epub 2009 Nov. 16, incorporated by reference herein in its entirety, notes that aging is a major risk factor for metabolic disease and loss of skeletal muscle mass and strength, a condition known as sarcopenia. Both conditions present a major health burden to the elderly population. Wenz et al. analyzed the effect of mildly increased PGC-1alpha expression in skeletal muscle during aging, and found that transgenic MCK-PGC-1 alpha animals had preserved mitochondrial function, neuromuscular junctions, and muscle integrity during aging. Increased PGC-1alpha levels in skeletal muscle prevented muscle wasting by reducing apoptosis, autophagy, and proteasome degradation. The preservation of muscle integrity and function in MCK-PGC-1alpha animals resulted in significantly improved whole-body health; both the loss of bone mineral density and the increase of systemic chronic inflammation, observed during normal aging, were prevented. Importantly, MCK-PGC-1alpha animals also showed improved metabolic responses as evident by increased insulin sensitivity and insulin signaling in aged mice. These results of Wenz et al. highlight the importance of intact muscle function and metabolism for whole-body homeostasis and indicate that modulation of PGC-1alpha levels in skeletal muscle presents an avenue for the prevention and treatment of a group of age-related disorders.

Still other studies have examined the effect of exercise on insulin action. For example, Vind B F, et al., Impaired insulin-induced site-specific phosphorylation of TBC1 domain family, member 4 (TBC1D4) in skeletal muscle of type 2 diabetes patients is restored by endurance exercise-training, Diabetologia. 2011 January; 54(1):157-67, Epub 2010 Oct. 13, (incorporated by reference herein in its entirety), notes that phosphorylation of TBC1 domain family, member 4 (TBC1D4) is, at present, the most distal insulin receptor signalling event linked to glucose transport, and examines insulin action on site-specific phosphorylation of TBC1D4 and the effect of exercise training on insulin action and signalling to TBC1D4 in skeletal muscle from type 2 diabetic patients.

In the study, during a 3 h euglycaemic-hyperinsulinaemic (80 mU min⁻¹ m⁻²) clamp, Vind et al. obtained M. vastus lateralis biopsies from 13 obese type 2 diabetic and 13 obese, non-diabetic control individuals before and after 10 weeks of endurance exercise-training. Before training, reductions in insulin-stimulated R (d), together with impaired insulin-stimulated glycogen synthase fractional velocity, Akt Thr³⁰⁸ phosphorylation and phosphorylation of TBC1D4 at Ser³¹⁸, Ser⁵⁸⁸ and Ser⁷⁵¹ were observed in skeletal muscle from diabetic patients. Exercise-training normalized insulin-induced TBC1D4 phosphorylation in diabetic patients. This happened independently of increased TBC1D4 protein content, but exercise-training did not normalize Akt phosphorylation in diabetic patients. In both groups, training-induced improvements in insulin-stimulated R(d) (˜20%) were associated with increased muscle protein content of Akt, TBC1D4, α2-AMP-activated kinase (AMPK), glycogen synthase, hexokinase II and GLUT4 (20-75%).

Thus, it was concluded that impaired insulin-induced site-specific TBC1D4 phosphorylation may contribute to skeletal muscle insulin resistance in type 2 diabetes. And the mechanisms by which exercise-training improves insulin sensitivity in type 2 diabetes may involve augmented signalling of TBC1D4 and increased skeletal muscle content of key insulin signalling and effector proteins, e.g., Akt, TBC1D4, AMPK, glycogen synthase, GLUT4 and hexokinase II.

Finally, as noted, there is an intimate link between obesity and diabetes. Problems with obesity, and the aspect of the present invention for treating obesity with isometric exercise is discussed above. Part of that discussion focuses on the FOXC2 gene and a newly revealed hormone, irisin (see, Cederberg A, et al., FOXC2 is a winged helix gene that counteracts obesity, hypertriglyceridemia, and diet-induced insulin resistance, Cell. 2001 Sep. 7; 106(5):563-73; and Boström P., et al., A PGC1-α-dependent myokine that drives brown-fat-like development of white fat and thermogenesis, Nature. 2012 Jan. 11; 481(7382):463-8. doi: 10.1038/nature10777). Another aspect of the present invention contemplates many of the therapeutic benefits of this hormone (and its isometric exercise-induced secretion) also being used as a therapy for diabetes.

Thus, like the method of the present invention for lowering the resting systolic and diastolic blood pressures of patients (described above), another aspect of the present invention includes a method for treating diabetes via isometric exercise. This method may begin with a determination of the maximal isometric force which can be exerted by a patient with any given muscle (e.g., skeletal muscle or group of muscles) of such patient. The determined maximal isometric force is recorded. The patient, then, is periodically permitted to intermittently engage in isometric contraction of the given muscle at a fractional level of the maximal force determined for a given contraction duration followed by a given resting duration. A perceptible indicia correlative to the isometric force exerted by the given muscle is displayed to the patient so that the patient can sustain the given fractional level of maximal force.

A representative procedure for a patient to follow includes the patient exerting a force with a selected muscle or muscle group to about 50%.+−0.5% of the previously determined maximal isometric force (of that muscle or muscle group) and holding that 50% force for 45 seconds; resting for one minute; and then repeating multiple times. The particular muscle or muscle group may be selected based upon the treatment desired. For example, the method may include exerting a squeezing force with either hand equal to about 50%.+−0.5% of the previously determined maximal isometric force and holding that 50% force for 45 seconds; resting for one minute; exerting a force with the other hand equal to 50% of the maximum for 45 seconds; resting one minute; exerting a force of 50% of maximum for 45 seconds again with the first hand; resting one minute; and exerting a force of 50% for 45 seconds again with the second hand. This completes the isometric exercise for that day. The same procedure may be followed by the patient multiple days (e.g., at least five days per week). It will be recognized by those of ordinary skill in the art that the use of “hand” for the muscle group is exemplary.

Thus, the isometric component of exercise alone can be used to stimulate NO production to increase arterial diameter and treat diabetes, by following a simple, yet effective, regimen that includes exerting fractional isometric force by any given muscle (for present purposes, “muscle” includes any skeletal muscle or group of muscles) for a given duration followed by a given duration of resting. This sequence is repeated several times (say, from about 3 to 6 times) and the entire regimen is repeated several times per week (say, from about 3 to 7 times per week). Since the regimen takes only several minutes per day to complete, it is believed that patients will be better able to stay with the program and, thus, receive long term benefits in treating diabetes. Moreover, since the patient exerts only a fraction of the maximal force of the given muscle, the patient's blood pressure during the exercise protocol does not rise to unacceptably high values whereat the patient's health would be at risk.

An important aspect of the therapeutic method associated with the instrument of the invention resides in the limiting of user performance to carry out the regimen of trials. In this regard, the instrument is programmed to perform only within predetermined and mandated test limits. Each therapeutic regimen is based upon an initial evaluation of the maximum gripping force capability of the user. Under that limitation, target load factors, hold on target load intervals, intervening rest intervals and trial repetition numbers may be elected only from pre-established and mandated memory retained ranges. The program also nominates rest intervals and hold on target intervals in correspondence with user elected target force factors. Thus, valuable strength recovery and development may be achieved but only within safe limits.

Additionally, the instrument is employable as a therapeutic device. First a protocol is nominated by prescribing nominal parameters of the effort. Each isometric regimen is controlled initially by requiring that a maximum grip strength be established for each individual patient or user. Then, the practitioner may elect parameters of grip force and timing under mandated memory contained parameter limits. Accordingly, the user will be unable to carry out strength enhancement therapies which would otherwise constitute an excessive grip force regimen. For carrying out the noted diagnostic procedures as well as therapy activities, the grip widthwise extent is variable from 1⅞ inches to 2⅞ inches, such variation being adjustable in ½ inch increments. This is in keeping with standardized diagnostic practices. Further with respect to diagnostic procedures, the display or readout of the instrument can be adjusted with respect to the grip structuring such that only the practitioner or therapist may observe the data which is being developed during a diagnostic protocol.

More particular description of examples of protocols are shown in FIG. 19, (described in greater detail above), which presents a flow diagram that outlines the methodology achieving this safe utilization of isometric exercises.

While the various aspects of the present invention have been disclosed by reference to the details of various embodiments of the invention, it is to be understood that the disclosure is intended as an illustrative rather than in a limiting sense, as it is contemplated that modifications will readily occur to those skilled in the art, within the spirit of the invention and the scope of the appended claims. 

The invention claimed is:
 1. A method of treating erectile dysfunction in a male mammal or enhancing sexual sensitivity in a female mammal, comprising: applying a force to an isometric exercising mechanism via an elected exercisable muscle group of the musculature of a user; wherein said isometric exercising mechanism is responsive to said force; and wherein the application of said force increases shear stress on a blood vessel wall of the user to induce the synthesis of endothelial nitric oxide synthase to synthesize nitric oxide in the user, thereby increasing the amount of bioavailable nitric oxide in the user.
 2. The method of claim 1, wherein said isometric exercising mechanism includes a handgrip assembly including a load cell component responsive to compressive squeezing by a hand of the user to provide a load value output.
 3. The method of claim 2, further comprising providing a display having a visual readout on said handgrip assembly; determining a target load value predicted to modulate the release of nitric oxide by the vascular endothelium of the user; and prompting the user at said display to apply a squeezing force to said handgrip assembly at said target load value.
 4. The method of claim 3, further comprising the step: providing a memory and recording in said memory a recording score value corresponding with score values corresponding with a comparison of a load value outputs from said load cell, to said target load value.
 5. The method of claim 3, in which said recording score value corresponds with a running average of said score values.
 6. The method of claim 3, further comprising recording the date of occurrence of said steps in said memory; providing an interactive communication port operably associated with said memory; and downloading the data recorded in memory from said interactive communications port to a data receiving facility.
 7. The method of claim 3, wherein determining a target load value predicted to modulate the release of nitric oxide by the vascular endothelium of the user provides step data wherein, for a sequence of steps I through N load factors are assigned from within a range from about 20% to about 100% of a maximum load.
 8. The method of claim 3, wherein determining a target load value predicted to modulate the release of nitric oxide by the vascular endothelium of the user provides step data wherein, for a sequence of steps I through N hold intervals are assigned from within a range from about 5 seconds to about 120 seconds.
 9. The method of claim 3, wherein determining a target load value predicted to modulate the release of nitric oxide by the vascular endothelium of the user provides step data wherein, for a sequence of steps I through N rest intervals are assigned from within a range from about 50 seconds to about 120 seconds.
 10. The method of claim 1, wherein said exercisable region of the musculature of said user is chosen from: jaw muscles, neck muscles, shoulder muscles, upper arm muscles, lower arm muscles, hand muscles, finger muscles, diaphragm muscles, abdominal muscles, lower back muscles, upper leg muscles, lower leg muscles, ankle muscles, foot muscles, and toe muscles. 